Crossword Genius

Use various keys in a composition? (4)

Ross

I believe the answer is:

type

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'composition?' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for type that I've seen before include "Sort; printed letters" , "Print form" , "key" , "Genre" , "Kind - kind of writing" .)

I've seen this clue in The Irish News.
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