No waiting in this eatery? (9)
I believe the answer is:
cafeteria
'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" .)