Crossword Genius

A musical interval (6)

Ross

I believe the answer is:

octave

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

This is the entire clue.

(Other definitions for octave that I've seen before include "Group of eight lines" , "Musical range" , "double the frequency?" , "Note an eighth above or below another" , "A verse of eight lines" .)

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