Crossword Genius

River that flows through Middlesbrough to the North Sea (4)

Ross

I believe the answer is:

tees

(Other definitions for tees that I've seen before include "Middlesbrough's river" , "Golf ball props" , "Sides of Trent" , "River in NE England" , "Starting places on the golf course" .)

I've seen this clue in The Mirror.
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