Time to beware, found in eight of the Across answers

Question:

Answer:

IDES

Length:

Similar Crossword Questions:

Brief time (found in all four theme answers)
"Lost time is never found again," e.g.
Nerve, found in eight of the Across answers
Time to beware
Internet interjection found in two theme answers
Postseason gridiron game, and a hint to the puzzle theme found in starred answers
Dream found in this puzzle's seven longest answers
Computer port found in the four longest answers
Black Friday destination found in nine of this puzzle's Across answers
Geeky sort found within this puzzle's four longest answers
They're found at the ends of this puzzle's three other longest answers
'Old MacDonald' sequence found in this puzzle's 10 longest answers
Service found in the four longest Across answers herein
Imported item found in eight answers (in the letters indicated)
Tools for ESP researchers (whose symbols are found at the ends of the answers to the five asterisked clues)
"Central" Ireland found in four puzzle answers
Thanksgiving side dish found in the longest Across answers
Two-time Oscar winner whose identity is "mistaken" in five puzzle answers
They're found at the end of this puzzle's longest answers
"The wart stops here" product, and a hint to the theme found in eight puzzle answers
AprÃ¨s-___ (following a day on the slopes -- and, literally, where the first words of the four longest puzzle answers can be found)
Surprise quiz found in the eight longest puzzle answers
It includes a vest ... and what can be found in each set of circles in the long answers
Puzzle honoree found in eight long answers
Main thoroughfare in Manhattan (one can be found in each of the four long answers in this puzzle)