Crossword Genius

Stretch up the river? (5)

Ross

I believe the answer is:

reach

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'stretch up' is the first definition.
'reach' can be an answer for 'stretch' (I've seen this in another clue). I am not sure about the 'up' bit.

'river?' is the second definition.
(I know that reach is a type of river)

'the' acts as a link.

Can you help me to learn more?

(Other definitions for reach that I've seen before include "Come up to - stretch between bends" , "Arrive at a point" , "stretch of canal between locks" , "Get to < throw up in the old" , "range" .)

I've seen this clue in the Evening Standard.
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