It's excessively used by composers (6)

I believe the answer is:

troppo

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'used by composers' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can occasionally define each other.

I don't understand the remainder of the clue.

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(Other definitions for troppo that I've seen before include "too much when playing" , "too much for musicians" , "Driven mad [STRINE]" , "Too much musical" .)

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

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