Reduced charge for salad ingredient (3)
I believe the answer is:
cos
'salad ingredient' is the definition.
(I've seen this before)
'reduced charge' is the wordplay.
'reduced' means to remove the last letter.
'charge' becomes 'cost' (I've seen this in other clues).
'cost' with its final letter removed is 'COS'.
'for' is the link.
(Other definitions for cos that I've seen before include "providing unsatisfactory explanation?" , "Casual as" , "often associated with sin" , "foreign island" , "Island in Mediterranean" .)