It's a funny thing to read (5)

I believe the answer is:

comic

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for comic that I've seen before include "Stand-up possibly" , "Funny entertainer, often stand-up" , "Amusing person" , "Stand-up comedian" , "Garden perhaps" .)

I've seen this clue in the Evening Standard.

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