| Cortex product | 14 |
| Concept. | 8 |
| Comic's light bulb | 22 |
| Comic-book light bulb | 21 |
| Cogitator's reward | 22 |
| Coconut yield? | 14 |
| Coconut product? | 16 |
| Child of invention? | 19 |
| Certain germ | 12 |
| Cerebral spark | 14 |
| Cause of an ''aha'' moment | 42 |
| Cartoon light bulb indication | 29 |
| Cartoon "bulb" | 24 |
| Bright thing that comes to mind | 31 |
| Bright thing from gray matter | 29 |
| Bright one from gray matter | 27 |
| Brainy inspiration | 18 |
| Brainstorming product | 21 |
| Brainstormer's pursuit | 26 |
| Brainstorm found in the long answers | 36 |
| Brain's offspring | 21 |
| Brain trust offering | 20 |
| Brain popper | 12 |
| Brain matter? | 13 |
| Brain gain | 10 |
| Brain child | 11 |
| Bit of planning | 15 |
| Birth of an invention | 21 |
| Birth of a plan, perhaps | 24 |
| Big Time Rush "No ___" | 32 |
| Bee Gees album title | 20 |
| Bean concoction? | 16 |
| Basis for a patent | 18 |
| Author's inspiration | 24 |
| Anagram for aide | 16 |
| Adman's start | 17 |
| A result of cerebration | 23 |
| A lightbulb can represent it | 28 |
| A good one may come to mind | 27 |
| A good one is often carried out | 31 |
| A finger in the air might connote one | 37 |
| 1968 Bee Gees album | 19 |
| [Lightbulb!] | 12 |
| "You have no ___!" | 28 |
| "You got a better ___?" | 33 |
| "Why, the very ---!" | 30 |
| "Whose ___ was this?" | 31 |
| "What's the bright ___?" | 38 |
| "What's the big ___?!" | 36 |
| "What's the big __ ?" | 35 |
| "What's the ___?!" | 32 |
| "The very" thing? | 27 |
| "The very ---!" | 25 |
| "The very ___!" (hmmph!) | 34 |
| "The _____!" (hmmph!) | 31 |
| "That's the ___!" ("Good thinking!") | 60 |
| "That's a great ___!" | 35 |
| "Now there's an ___!' | 34 |
| "No ___" ("Don't ask me") | 49 |
| "Light bulb" | 22 |
| "If at first, the ___ is not absurd, then there is no hope for it": Einstein | 86 |
| "I've got an __!" | 31 |
| "I have no _____!" | 28 |
| "I had no __!" | 24 |
| "Hey, what's the big ---?" | 40 |
| "Here's an ___" | 29 |
| "Here's an ___ ..." | 33 |
| "For poetry the ___ is everything": Matthew Arnold | 60 |
| "Eureka!" elicitor | 28 |
| "Drawing is putting a line round an ___": Henri Matisse | 65 |
| "Bad ___ Jeans" (classic SNL skit) | 44 |
| "An __ is salvation by imagination": Frank Lloyd Wright | 65 |
| "Aha!" elicitor | 25 |
| "Aha moment" cause | 28 |
| "Ah-ha" predecessor | 29 |
| " . . . an ___ whose time has come": Hugo | 51 |
| 'What's the big --?' | 32 |
| ''You have no ___!'' | 36 |
| ''The very'' item | 33 |
| ''The very ___!'' (''What nerve!'') | 67 |
| ___ man (game-show creator) | 27 |
| Standard of perfection | 22 |
| Something to shoot for | 22 |
| Exemplar | 8 |
| Standard of excellence | 22 |
| Exemplary | 9 |
| Best-case scenario | 18 |
| Best possible | 13 |
| Model of excellence | 19 |
| Model of perfection | 19 |
| Suitable in every way | 21 |
| Nonesuch | 8 |
| Perfect model | 13 |
| "In an ___ world ..." | 31 |
| Perfection | 10 |
| Just the way it should be | 25 |
| Epitome | 7 |
| Worth a ten, maybe | 18 |
| Unflawed | 8 |
| Symbol of perfection | 20 |