That far into the bass is more than enough for virtuoso passage (4)

I believe the answer is:

solo

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'passage' is the definition.
(I have seen 'Unaccompanied passage ' mean 'solo' so perhaps 'passage' could also mean 'solo')

I cannot understand how the remainder of the clue works.

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(Other definitions for solo that I've seen before include "(Piece performed) on one's own" , "On one's own, unaccompanied" , "Lone" , "Fly aircraft" , "Done by one person" .)

I've seen this clue in The Independent.

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