Harvest, as crops (4)
I believe the answer is:
reap
'harvest as crops' 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 "Cut and gather (crop)" , "Save harvest, glean" , "Harvest, garner" , "Use a scythe" , "Derive as a reward" .)