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43 across is IFARTED
The clue is “Involuntarily made noise while laughing, perhaps”, so sure
Do you want help, because that sounds like
spoiler
snorted
Also crowdsourcing a crossword sounds either fun or terrible
c/askouija style, top level comment is the clue and number of letters, ouija provides the response
Oh, then it must be sharted.
SHARTED
Edit: pulled the trigger before I saw your other reply.