Crossword Genius

Longest river in Britain (6)

Ross

I believe the answer is:

severn

'longest river in britain' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for severn that I've seen before include "Longest river in Britain" , "England's longest river" , "Longest UK river" , "River rising in Wales" , "River at Worcester" .)

I've seen this clue in The Irish Times, the Irish Times (Simplex) and The Guardian.
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