Crossword Genius

Shannon Tweed has more than one (5)

Ross

I believe the answer is:

river

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

'one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for river that I've seen before include "It flows" , "Flowing water" , "Large flow of liquid" , "Eg, Amazon" , "Tees, perhaps" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app