Crossword Genius

Two notes above second octave (4)

Ross

I believe the answer is:

utas

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'octave' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for utas that I've seen before include "Octave" , "Lost eight days of a festival" .)

I've seen this clue in The Times and The Sunday Times.
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