Fanny's clever rhyme (5)

I believe the answer is:

canny

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'fanny's clever rhyme' is the definition.
I can't tell whether this defines the answer.

'fanny's clever rhyme' is the wordplay.
'fanny' becomes 'can' (synonyms).
'clever rhyme' becomes 'ny' (I can't explain this - if you can you should give a lot more credence to this answer).
'can'+'ny'='CANNY'

Can you help me to learn more?

(Other definitions for canny that I've seen before include "Shrewd, knowing" , "Shrewd like Scotsman" , "Worldly-wise" , "Fly" , "Shrewd, clever" .)

I've seen this clue in the Evening Standard.

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