Crossword Genius

No waiting in this eatery? (9)

Ross

I believe the answer is:

cafeteria

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'eatery?' is the definition.
(I know that cafeteria is a type of eatery)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cafeteria that I've seen before include "Self-service eatery" , "eating-place" , "Canteen" , "greasy spoon?" , "dining-room" .)

I've seen this clue in The Telegraph.
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