Worthy of taking a rise out of, for a laugh? (7)

I believe the answer is:

risible

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'worthy' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for risible that I've seen before include "Producing amusement" , "Farcical" , "Laughable, really ridiculous" , "Laughter-provoking" , "Laughable, amusing" .)

I've seen this clue in the Evening Standard.

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