Crossword Genius

Definition of baritone (sound) one may check on phone? (9)

Ross

I believe the answer is:

voicemail

I'm a little stuck... Click here to teach me more about this clue!

'definition of baritone' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'sound one may check on phone?' is the wordplay.
I cannot quite see how this works, but
'sound' could be 'voice' (voice is a kind of sound) and 'voice' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
The remaining letters 'mal' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for voicemail that I've seen is " What's reached, when someone can't be reached!".)

I've seen this clue in The Times.
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