Wild cats -- not hers for long (4)
I believe the answer is:
pant
'long' is the definition.
(I've seen this before)
'wild cats not hers' is the wordplay.
'wild cats' becomes 'panthers' (panthers are big cats).
'not' indicates named letters should be taken away.
'panthers' with 'hers' taken away is 'PANT'.
'for' is the link.
(Other definitions for pant that I've seen before include "Long" , "Breathe noisily after running" , "Gasp for breath (like a hot dog?)" , "Struggle for breath" , "Breathe hard" .)