Making new sort of punk, met Shaggy! (7)
'shaggy' is the definition.
'making new sort of punk met' is the wordplay.
'making new sort of' indicates an anagram (the letters sorted in a new order).
'punkmet' anagrammed gives 'UNKEMPT'.
(Other definitions for unkempt that I've seen before include "Not neat or cared for", "shabby", "With neglected look", "Bedraggled", "Met punk looking neglected with matted hair".)