Form risen a bit, top of the class? (9)

I believe the answer is:

brainiest

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'form risen a bit top of the class?' is the definition.
I can't tell whether this defines the answer.

'form risen a bit' is the wordplay.
'form' is an anagram indicator.
'risen'+'a'+'bit'='risenabit'
'risenabit' anagrammed gives 'BRAINIEST'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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