Harvest some more apples (4)
I believe the answer is:
reap
'harvest' is the definition.
('reap' can be a synonym of 'harvest')
'some more apples' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'REAP' is hidden in the letters of 'more apples'.
(Other definitions for reap that I've seen before include "Get -- derive" , "Use a scythe" , "Derive as a reward" , "Save harvest, glean" , "Cut and gather (crop)" .)