Unkempt beauty partied topless (11)
I believe the answer is:
dishevelled
'unkempt' is the definition.
(I've seen this before)
'beauty partied topless' is the wordplay.
'beauty' becomes 'dish' (slang term for an attractive person).
'partied' becomes 'revelled'.
'topless' means to remove the first letter.
'revelled' with its initial letter removed is 'evelled'.
'dish'+'evelled'='DISHEVELLED'
(Other definitions for dishevelled that I've seen before include "Blowzy" , "(Of hair, clothes) untidy" , "ill-groomed" , "Tousled" , "Rumpled" .)