Crossword Genius

How to impersonate Mephisto? (8)

Ross

I believe the answer is:

nickname


If this is the answer I cannot explain how the clue works.

(Other definitions for nickname that I've seen before include "A handle" , "Agnomen" , "Familiar appellation" , "Cognomen" , "Jocular moniker" .)

I've seen this clue in The Guardian.
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