Rest before quick meal (9)
I believe the answer is:
breakfast
'meal' is the definition.
(I know that breakfast is a type of meal)
'rest before quick' is the wordplay.
'rest' becomes 'break' (I've seen this before).
'before' says to put letters next to each other.
'quick' becomes 'fast' (similar in meaning).
'break'+'fast'='BREAKFAST'
(Other definitions for breakfast that I've seen before include "Morning meal" , "See 24" , "beginning to day" , "croissants?" , "First meal at Tiffany's" .)