Crossword Genius

Horse crossing northern river in France (5)

Ross

I believe the answer is:

marne

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

'horse crossing northern' is the wordplay.
'horse' becomes 'mare' (mare is a kind of horse).
'crossing' indicates putting letters inside (to cross can mean to go over or around).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'mare' enclosing 'n' is 'MARNE'.

I've seen this clue in the Best For Puzzles.
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