Give up on French return (9)
I believe the answer is:
surrender
'give up' is the definition.
(I know that give up can be written as surrender)
'on french return' is the wordplay.
'on' is a charade indicator (letters next to each other).
'french' becomes 'sur' (I've seen this in other clues).
'return' becomes 'render' (synonyms).
'sur'+'render' is 'SURRENDER'.
(Other definitions for surrender that I've seen before include "submission" , "Cease resistance" , "Yield, give in" , "Hand over" , "Capitulation" .)