Wheels on loan ... or, as the circles show, what four puzzle answers have done?

Question:

Answer:

RENTACAR

Length:

Similar Crossword Questions:

Cryptographers' successes (and what can be found in the circles in this puzzle's long answers)
Interview show since 1947 ... and what this puzzle's starred answers do in two ways
Show since 12/17/1989 whose five main family members are hidden in this puzzle's other long across answers
What can be said about the answers to this puzzle's capitalized clues
Nanobot's hypothetical ability, and the process that's overtaken this puzzle's theme answers
Entertainer (1938-2007) whose first name is hidden in eight puzzle answers including this one
Choice words swapped in this puzzle's theme answers
What this puzzle's theme answers contain (if you look closely enough)
String of letters found in this puzzle's longest Across answers
You can find one in the four longest puzzle answers, even if you don't believe
Certain filings, and what happens literally in six of this puzzle's answers
Bird hiding in the four longest puzzle answers
"Dough" found in this puzzle's four longest answers
Pro baseball level ... or a hint to 12 answers in this puzzle
This puzzle's theme found in the answers to five asterisked clues
Torte holder ... or a hint to completing ten answers in this puzzle
Things that this puzzle's nine longest answers have
Instrument that hints at the missing parts of certain answers in this puzzle
1964 Berne best seller (and a hint to seven other answers in this puzzle)
Woman associated with seven other answers in this puzzle
Coastal irregularities, and word anagrammed in this puzzle's four longest answers
They're hidden in seven long answers in this puzzle
It uses only the 12 letters A, E, H, I, K, L, M, N, O, P, U and W (like eight long answers in this puzzle)
Phrase with synonyms starting this puzzle's eight longest Across answers
Like the Oscars ... or the answers to this puzzle's seven asterisked clues?