Musical interval is sinister coming from service station (6)

I believe the answer is:

octave

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'musical interval' is the definition.
(I know that octave is a type of musical interval)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for octave that I've seen before include "At cove (anag.)" , "Series of eight notes in music" , "Series of eight notes on a scale" , "A group of eight consecutive musical notes" , "Interval of 12 semitones" .)

I've seen this clue in The Irish Times.

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