Wild dog hiding out? Not entirely (5)
I believe the answer is:
dingo
'wild dog' is the definition.
(dingo is a kind of wild dog)
'hiding out? not entirely' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'DINGO' can be found hidden inside 'hiding out'.
(Other definitions for dingo that I've seen before include "Wild creature" , "Australian native" , "Wild thing" , "One running wild in Australia" , "Wild animal" .)