Answer: winnowing

AnswerCrossword Clue
winnowingFind or identify (a valuable or useful part of something)
winnowingBlow a current of air through (grain) in order to remove the chaff
winnowingRemove (chaff) from grain
winnowingReduce the number in a set of (people or things) gradually until only the best ones are left
winnowingWINNOW, to separate chaff from grain
winnowing(of the wind) Blow
winnowing(of a bird) Fan (the air) with wings
winnowingIdentify and remove (the least valuable or useful people or things)