Crossword Genius

River no longer noted? (3)

Ross

I believe the answer is:

exe

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

'river' is the definition.
(River Exe)

'no longer noted?' is the wordplay.
I cannot really see how this works, but
'no longer' could be 'ex' (prefix meaning former or onetime) and 'ex' is present in the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for exe that I've seen before include "Somerset/Devon river" , "Runner" , "River in SW UK" , "Tiverton's river" , "River of southwest England" .)

I've seen this clue in the Evening Standard.
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