A rash sort of girl? (5)
I believe the answer is:
sarah
'girl?' is the definition.
'a rash sort' is the wordplay.
'sort' indicates an anagram.
'a'+'rash'='arash'
'arash' is an anagram of 'SARAH'.
'of' is the link.
(Other definitions for sarah that I've seen before include "Abraham's wife (OT)" , "Woman" , "Girl" , "Girl's name" , "Lady" .)