Puff of wind (4)
I believe the answer is:
gust
'puff of wind' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gust that I've seen before include "A big blow" , "Puff (of wind)" , "Blast of air" , "Sudden rush of wind" , "Flurry" .)