Untidy; dishevelled (7)
I believe the answer is:
unkempt
This clue is a double definition.
'untidy' is the first definition.
(similar in meaning)
'dishevelled' is the second definition.
(I've seen this before)
(Other definitions for unkempt that I've seen before include "Of uncared for appearance" , "Messy" , "Slovenly" , "shabby" , "Not neat or cared for" .)