Do they make us speechless with laughter? (4)

I believe the answer is:

gags

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'do they' is the definition.
The definition suggests a plural noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for gags that I've seen before include "Muzzles or jokes." , "Muffles with slangy jokes" , "Prevents from speaking the jokes" , "Jokes - silences" , "Jokes; chokes" .)

I've seen this clue in the Evening Standard.

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