American monk with a halo that's slipped (9)
I believe the answer is:
oklahoman
'american' is the definition.
(I know that Oklahoman is a type of american)
'monk with a halo that's slipped' is the wordplay.
'with' means one lot of letters go next to another.
'that's slipped' is an anagram indicator.
'a'+'halo'='ahalo'
'monk' after 'ahalo' is 'ahalomonk'.
'ahalomonk' is an anagram of 'OKLAHOMAN'.
(Other definitions for oklahoman that I've seen before include "American" , "US resident" , "from Tulsa?" .)