Crossword Genius

Mr Case, the punster? (6)

Ross

I believe the answer is:

justin

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'mr' is the definition.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for justin that I've seen before include "Boy" , "-- Timberlake, singer" , "Boy's name" .)

I've seen this clue in the Evening Standard.
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