Comic librettist weirdly wants the Three Tenors (7)

I believe the answer is:

risible

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'comic' is the definition.
(I know that comic can be written as risible)

I don't understand the rest of the clue.

(Other definitions for risible that I've seen before include "making one laugh" , "Laughable, really ridiculous" , "Laughable, amusing" , "A complete joke!" , "Funny - not even funny" .)

I've seen this clue in The Independent.

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