That whimsical fellow? (3)

I believe the answer is:

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'fellow' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for him that I've seen before include "Objective male pronoun" , "Proper character" , "That man" .)

I've seen this clue in the Evening Standard.

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