Crossword Genius

Divide northern river (6)

Ross

I believe the answer is:

severn

'river' is the definition.
(I've seen this before)

'divide northern' is the wordplay.
'divide' becomes 'sever' (severing is a kind of dividing).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'sever'+'n'='SEVERN'

(Other definitions for severn that I've seen before include "Major UK river" , "Shrewsbury's river" , "Longest British river" , "River rising in Wales" , "River with famous bore" .)

I've seen this clue in The Independent.
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