Take short breaths (4)
I believe the answer is:
pant
'take short breaths' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pant that I've seen before include "Breathe noisily after running" , "Long" , "Breath rapidly" , "Breath noisily from exertion" , "Sound out of breath" .)