"Laughter . . . the most civilised ____ in the world” (Peter Ustinov) (5)

I believe the answer is:

music

(Other definitions for music that I've seen before include "Shakespeare: 'If . . . . . be the food of love, play on'" , "Audible art form ..." , "Melody, harmony" , "A score represents it" , "Melodious sound" .)

I've seen this clue in The Times.

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