An indication of considerable volume in which one excels (5)

I believe the answer is:

forte

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'volume in which one excels' is the definition.
'forte' can be an answer for 'volume' (forte is a kind of volume). I am not sure about the remainder of the definition.

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 "speciality" , "In music, to be played loudly" , "Musically, loud" , "Thing at which one excels" , "Skill" .)

I've seen this clue in The Irish Independent.

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