Utter in semitones (4)

I believe the answer is:

emit

'utter' is the definition.
(I know that utter can be written as emit)

'in semitones' is the wordplay.
'in' indicates a hidden word.
'EMIT' is hidden in the letters of 'semitones'.

(Other definitions for emit that I've seen before include "Discharge - utter" , "Give off, gas say" , "Send out in time" , "'Give off, odour say (4)'" , "Exhale" .)

I've seen this clue in the Evening Standard.

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