Refuse girl pasty (8)
I believe the answer is:
disallow
'refuse' is the definition.
(thesaurus)
'girl pasty' is the wordplay.
'girl' becomes 'Di'.
'pasty' becomes 'sallow' (I've seen this before).
'di'+'sallow'='DISALLOW'
(Other definitions for disallow that I've seen before include "Prevent" , "Prohibit, veto" , "Refuse to accept as valid, as judge might a claim" , "bar" , "Reject" .)