Dark-haired animal getting outside trap (8)
I believe the answer is:
brunette
'dark-haired' is the definition.
('brunette' can be similar in meaning to 'dark-haired')
'animal getting outside trap' is the wordplay.
'animal' becomes 'brute' ('brute' can be a synonym of 'animal'**).
'getting outside' indicates putting letters inside.
'trap' becomes 'net' (net is a kind of trap).
'brute' placed around 'net' is 'BRUNETTE'.
(Other definitions for brunette that I've seen before include "Hair colour" , "Brown-haired" , "woman with brown hair" , "Kind of dark girl" , "girl unlike Goldilocks?" .)