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 a hidden word.
'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" .)