One of our English rivers (3)

I believe the answer is:

ure

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'one' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'of our english rivers' is the wordplay.
'of' indicates a hidden word.
'URE' is hidden in the letters of 'our english rivers'.

Can you help me to learn more?

(Other definitions for ure that I've seen before include "Ripon's river" , "River of N. Yorkshire" , "River at Ripon" , "North Yorkshire river" , "Wensleydale river" .)

I've seen this clue in the Evening Standard.

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