Send back some stale chocolates (4)
I believe the answer is:
echo
'send back' is the definition.
(I've seen this before)
'some stale chocolates' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ECHO' can be found hidden inside 'stale chocolates'.
(Other definitions for echo that I've seen before include "Repeat or reverberate" , "Mythical nymph" , "Rebounding sound" , "Send back" , "Greek nymph, spurned by Narcissus, who pined away until only her voice remained" .)