Part played by an all-Italian orchestra? (5)

I believe the answer is:

tutti

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'part' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for tutti that I've seen before include "when everyone plays" , "Everybody (mus.)" , "Everyone join in (mus.)" , "With all instruments playing at once (music)" , "Passage using all instruments" .)

I've seen this clue in the Evening Standard.

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