The clever fellow, in general, is round the bend! (6)
I believe the answer is:
genius
'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" .)