Cut (a crop) (4)
I believe the answer is:
reap
'cut a crop' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reap that I've seen before include "Cut the corn" , "''As you sow, so you . . . .'' (4)" , "Harvest (a crop)" , "Derive as advantage" , "Glean or cut as harvest" .)