Crossword Genius

Insular fellow? (3)

Ross

I believe the answer is:

man

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'fellow?' is the definition.
(fellow is a kind of man)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for man that I've seen before include "Geezer" , "race" , "Homo sapiens" , "-- Friday" , "Valet" .)

I've seen this clue in the Evening Standard.
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