Uncivilised person acquired heroin (4)
I believe the answer is:
goth
'uncivilised person' is the definition.
(the Goths were a Germanic tribe)
'acquired heroin' is the wordplay.
'acquired' becomes 'got' ('get' can be a synonym of 'acquire').
'heroin' becomes 'H' (H is a slang term for heroin).
'got'+'h'='GOTH'
(Other definitions for goth that I've seen before include "Uncivilised person" , "Old German; rock style" , "Uncivilised type" , "Girl in black perhaps" , "Teutonic invader of the Roman Empire" .)