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Primates upset over grade for dividing (10)

Ross

I believe the answer is:

separating

'dividing' is the definition.
('separate' can be a synonym of 'divide')

'primates upset over grade' is the wordplay.
'primates' becomes 'apes' (ape is a kind of primate).
'upset over' says the letters should be written in reverse (knocked over).
'grade' becomes 'rating' (I've seen this before).
'apes' written backwards gives 'sepa'.
'sepa'+'rating'='SEPARATING'

'for' is the link.

I've seen this clue in the Sydney Morning Herald.
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