Protestant in row in sultanate (9)
I believe the answer is:
orangeman
'protestant' is the definition.
(I know that Orangeman is a type of Protestant)
'row in sultanate' is the wordplay.
'row' becomes 'range' (I've seen this in other clues).
'in' indicates putting letters inside.
'sultanate' becomes 'oman' (I've seen this before).
'range' inserted inside 'oman' is 'ORANGEMAN'.
'in' is the link.
(Other definitions for orangeman that I've seen before include "Religious society member" , "Member of a Protestant Irish society" , "Northern Ireland Protestant" , "one used to marching?" .)