Copyright song entertaining fund-raiser for restaurant (9)
I believe the answer is:
cafeteria
'restaurant' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for cafeteria that I've seen before include "where food can be picked up" , "Self-service eating place" , "where food is served" , "Self-service restaurant" , "cheap restaurant" .)