Winnow (4)
'winnow' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cull that I've seen before include "Select to kill to lower numbers" , "Gather selectively" , "Choose the best from" , "Proportionate kill" , "Remove from herd" .)
'winnow' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pare that I've seen before include "Trim by cutting" , "Shave or peel" , "Whittle" , "Remove the skin from" , "Shave, say, pencil" .)
'winnow' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for thresh that I've seen before include "Scots rush" , "Extract grain from husks" , "Beat seeds out of grain" , "Separate grain from husks and straw" , "Separate grain from (corn); move violently" .)