Gather in a crop (4)
I believe the answer is:
reap
'gather in a crop' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reap that I've seen before include "Harvest (a crop)" , "Cut and gather (crop)" , "''As you sow, so you . . . .'' (4)" , "Harvest, garner" , "Derive as advantage" .)