Gather, pick (4)
I believe the answer is:
cull
This clue is a double definition.
'gather' is the first definition.
(I know that cull is a kind of gather)
'pick' is the second definition.
(I know that pick can be written as cull)
(Other definitions for cull that I've seen before include "Reduce size of herd by killing superfluous members" , "Choose the best from" , "Glean" , "Choose; thin out" , "Kill surplus animals in herd" .)