Wolf pup's home (3)
I believe the answer is:
den
'wolf pup's home' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for den that I've seen before include "Animal's lair or gent's study" , "Home of the beast" , "Wild animal's home" , "Animal's lair or man's study" , "Animals' shelter" .)