Musical interval (6)
'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 "Interval of 12 semitones" , "Musical range" , "Series of eight consecutive musical notes" , "Interval from one C to the next C" , "Eight consecutive notes on music scale" .)
'musical interval' is the definition.
(third is a kind of musical interval)
This is the entire clue.
(Other definitions for third that I've seen before include "Musical interval" , "Next after second" , "Less than half, rather" , "Tertiary" , "33 per cent" .)