Untidy she-devil led astray (11)
I believe the answer is:
dishevelled
'untidy' is the definition.
(similar in meaning)
'she-devil led astray' is the wordplay.
'astray' indicates anagramming the letters.
'she'+'devil'+'led'='shedevilled'
'shedevilled' is an anagram of 'DISHEVELLED'.
(Other definitions for dishevelled that I've seen before include "Unkempt" , "In mess" , "Untidy (in appearance)" , "(Of hair or clothing) untidy" , "(Of hair, clothes) untidy" .)