Crossword Genius

The eighth musical interval? (6)

Ross

I believe the answer is:

octave

I believe this is a double definition.

'the eighth' is the first definition.
(thesaurus)

'musical interval?' is the second definition.
(octave is a kind of musical interval)

(Other definitions for octave that I've seen before include "Musical term - set of eight" , "Interval from one C to the next C" , "Musical interval of eight notes" , "Group of eight lines" , "Note an eighth above or below another" .)

I've seen this clue in the Evening Standard.
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