In Roman numerals, there's nothing funny! (5)

I believe the answer is:

comic

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'funny' is the definition.
(comic can mean funny or humorous)

I don't understand the remainder of the clue.

(Other definitions for comic that I've seen before include "Causing laughter" , "Funny man, often stand-up" , "Funny, droll" , "Funny; comedian" , "magazine for kids" .)

I've seen this clue in the Evening Standard.

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