Father pulled back locks, revealing outcast (6)
I believe the answer is:
pariah
'outcast' is the definition.
(synonyms)
'father pulled back locks' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'pulled back' shows that the letters should be reversed in order.
'locks' becomes 'hair' (locks can mean hair).
'hair' in reverse letter order is 'riah'.
'pa'+'riah'='PARIAH'
'revealing' is the link.
(Other definitions for pariah that I've seen before include "Unacceptable person" , "An untouchable" , "Outcast (state)" , "Person despised and rejected by society" , "Small box for valuables" .)