Big huff? (4)
I believe the answer is:
pant
'big huff?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pant that I've seen before include "Sound out of breath" , "Struggle for breath" , "Breath noisily from exertion" , "Gasp for breath (like a hot dog?)" , "Long" .)