River sport (4)
I believe the answer is:
wear
I believe this clue is a double definition.
'river' is the first definition.
(river in the north east of England)
'sport' is the second definition.
(sport can mean to wear or display on one's person)
(Other definitions for wear that I've seen before include "Have on the body as clothes or ornaments" , "Dress in - impair - abrade - change course - river" , "Apparel" , "Have on; fray" , "brook" .)