Setting for Edward Hopper's "Nighthawks" (5)
I believe the answer is:
diner
'setting for edward hopper's nighthawks' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for diner that I've seen before include "US eatery" , "Small US restaurant" , "(One using) restaurant car" , "One taking a meal" , "one taking several courses" .)