Untouchable dad gets hair raised (6)
I believe the answer is:
pariah
'untouchable' is the definition.
(I've seen this before)
'dad gets hair raised' is the wordplay.
'dad' becomes 'pa' (both can mean one's father).
'gets' means one lot of letters go next to another.
'raised' says the letters should be written in reverse (going up in a down clue).
'hair' in reverse letter order is 'riah'.
'pa'+'riah'='PARIAH'
(Other definitions for pariah that I've seen before include "Unacceptable person" , "Small box for valuables" , "Person ostracised by society" , "Person despised and rejected by society" , "An untouchable" .)