Wild cat in part of pound (5)
I believe the answer is:
ounce
I believe this clue is a double definition.
'wild cat' is the first definition.
(I've seen this before)
'part of pound' is the second definition.
('ounce' is part of 'pound')
'in' acts as a link.
(Other definitions for ounce that I've seen before include "Carnivore" , "prowler" , "Lightweight" , "Imperial unit of weight" , "A light weight - feline" .)