White? Not he, the clever fellow! (3)
I believe the answer is:
wit
'the clever fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'white? not he' is the wordplay.
'not' indicates named letters should be taken away.
'white' with 'he' taken away is 'WIT'.
Can you help me to learn more?
(Other definitions for wit that I've seen before include "Funny person" , "Mental ability" , "Ingenuity or verbal fun" , "Intelligence; humorous person" , "Humour or common sense" .)