Dropped a stock complaint food shop rejected (8)
I believe the answer is:
abseiled
'dropped' is the definition.
(to abseil is to drop down a vertical surface)
'a stock complaint food shop rejected' is the wordplay.
'stock complaint' becomes 'BSE' (mad cow disease or BSE affects cattle or stock).
'food shop' becomes 'deli' (synonyms).
'rejected' says the letters should be written backwards.
'deli' backwards is 'iled'.
'a'+'bse'+'iled'='ABSEILED'
(Other definitions for abseiled that I've seen before include "Daringly dropped" , "descended using rope" , "Lowered oneself with a rope from a mountain" , "Descended rock face" .)