Fox hole (3)
I believe the answer is:
den
'fox hole' 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 "Gentleman's study or animal's lair" , "Wild animal's home" , "Habitation of wild animals (3)" , "Wild animal's lair" , "Hiding place" .)