Mammal’s foot (3)
I believe the answer is:
paw
'mammal's foot' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for paw that I've seen before include "Mammal's foot" , "Eg, a dog's foot" , "Animal foot or hill-billy dad" , "Cat's foot" , "Manhandle" .)