Crossword Genius

Overact manically: spectator finally bailing in interval (6)

Ross

I believe the answer is:

octave

'interval' is the definition.
(musical interval)

I don't understand how the remainder of the clue works.

(Other definitions for octave that I've seen before include "Twelve semitones" , "At cove (anag.)" , "Series of eight notes in music" , "eight days starting with a festival" , "double the frequency?" .)

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