Numbered musical composition (4)

I believe the answer is:

opus

'numbered musical composition' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opus that I've seen before include "Work (mus.)" , "Composer's work" , "Musical piece" , "Artistic work" , "Composition - magnum __" .)

I've seen this clue in the Family Time and the USA Today.

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