Marcher to roam with mother breaking leg (9)
I believe the answer is:
orangeman
'marcher' is the definition.
(Orangemen march in Northern Ireland)
'roam with mother breaking leg' is the wordplay.
'roam' becomes 'range' (range can mean to roam around).
'with' says to put letters next to each other.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'breaking' means one lot of letters goes inside another.
'leg' becomes 'on' (cricket term, fielding positions).
'range'+'ma'='rangema'
'rangema' put into 'on' is 'ORANGEMAN'.
'to' is the link.
(Other definitions for orangeman that I've seen before include "Northern Ireland Protestant" , "Member of a Protestant Irish society" , "Religious society member" , "one used to marching?" .)