All the composer required (5)

I believe the answer is:

tutti

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'all' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for tutti that I've seen before include "Musical instruction for all instruments to play" , "All performers (mus.)" , "Composer of Carmina Burana" , "With all instruments playing at once (music)" , "Instruction for all orchestral instruments to play together" .)

I've seen this clue in The Globe and Mail.

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