Flower display (4)
I believe the answer is:
wear
I believe this clue is a double definition.
'flower' is the first definition.
(river in the north east of England)
'display' is the second definition.
(to wear something is to display it on one's person)
(Other definitions for wear that I've seen before include "fashion" , "Accept" , "Northern flower" , "Become damaged by use" , "show" .)