Censor joke (3)

I believe the answer is:

gag

I believe this is a double definition.

'censor' is the first definition.
(thesaurus)

'joke' is the second definition.
(gagging is a kind of joking)

(Other definitions for gag that I've seen before include "Funny" , "Restriction; joke" , "A palindromic joke or muzzle" , "Joke; smother" , "Put a muzzle on the joke" .)

I've seen this clue in The Times.

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