Cubs' home (3)
I believe the answer is:
den
'cubs' 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 home or gent's study" , "Animals' shelter" , "Animal's lair or gent's study" , "Cave" , "Gentleman's study or animal's lair" .)