Protestants making sign going around province (9)
I believe the answer is:
orangemen
'protestants' is the definition.
(member of the Protestant Orange Order)
'sign going around province' is the wordplay.
'sign' becomes 'omen' (omen is a kind of sign).
'going around' means one lot of letters goes inside another.
'province' becomes 'range'.
'omen' enclosing 'range' is 'ORANGEMEN'.
'making' is the link.
(Other definitions for orangemen that I've seen before include "Loyalists" , "They wear sashes and march on July 12th" , "Colourful supporters of Protestantism in N Ireland" .)