Son, family nut, hairless oaf dressed in grunge (8)
I believe the answer is:
skinhead
'hairless oaf dressed in grunge' is the definition.
I can't tell whether this defines the answer.
'son family nut' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'family' becomes 'kin' (synonyms).
'nut' becomes 'head' (nut can mean one's head).
's'+'kin'+'head'='SKINHEAD'
Can you help me to learn more?
(Other definitions for skinhead that I've seen before include "voluntary exhibitor of 11" , "rough-looking" , "one with little up top though" , "Shaven tough" , "Youth with cropped hair" .)