The clever fellow, in general, is round the bend! (6)

I believe the answer is:

genius

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'the clever fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'general is round the bend' is the wordplay.
'general' becomes 'gen'.
'round' indicates putting letters inside.
'the bend' becomes 'U' (a U-bend is a kind of bend - pipe under sink).
'is' going around 'u' is 'ius'.
'gen'+'ius'='GENIUS'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for genius that I've seen before include "outstanding person" , "Prodigy" , "Person with exceptional abitity" , "Exceptional intellectual power" , "Exceptionally creative person" .)

I've seen this clue in the Evening Standard.

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