Crossword Genius

Steps governor advanced with river rising (5,4)

Ross

I believe the answer is:

bossa nova

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

'governor advanced with river rising' is the wordplay.
'governor' becomes 'boss' (I've seen this before).
'advanced' becomes 'a' (abbreviation).
'with' is a charade indicator (letters next to each other).
'river rising' becomes 'nova' (I can't justify this - if you can you should give a lot more credence to this answer).
'boss'+'a'+'nova'='BOSSA NOVA'

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(Other definitions for bossa nova that I've seen before include "(Music for) a Brazilian dance" , "steps taken" , "lively dance" , "Dance from Brazil similar to samba" , "Brazilian music, rhythmically related to the samba" .)

I've seen this clue in The Telegraph.
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