Crossword Genius

Amusing person for instance (4)

Ross

I believe the answer is:

case

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'instance' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for case that I've seen before include "proceedings" , "Trunk" , "Carefully inspect < suit" , "Box of twelve bottles of wine" , "Keep careful watch on" .)

I've seen this clue in The Sun and The Times.
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