Is it three times as high as the bass? (6)

I believe the answer is:

treble

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'bass?' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for treble that I've seen before include "Boy chorister" , "High voice - large drink" , "High boy's singing voice" , "Score of sixty with one dart?" , "Soprano - multiply by three" .)

I've seen this clue in the Evening Standard.

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