Flower from the foreign revolution is dividing opinion (10)

I believe the answer is:

polarising

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'is dividing opinion' is the definition.
I can't tell whether this defines the answer.

'flower from the foreign revolution' is the wordplay.
'flower' becomes 'po' (Italian river).
'from' is a charade indicator (letters next to each other).
'the foreign' becomes 'la'.
'revolution' becomes 'rising' (I can't justify this - if you can you should give a lot more credence to this answer).
'po'+'la'+'rising'='POLARISING'

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I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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