A loud piano piece (5)

I believe the answer is:

forte

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'a loud' is the definition.
(I know that loud can be written as forte)

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

Can you help me to learn more?

(Other definitions for forte that I've seen before include "Personal strong suit" , "A thing in which someone excels" , "Strength" , "speciality" , "sort of musical passage" .)

I've seen this clue in the Evening Standard.

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