Crossword Genius

Add one's ringing tones to the conversation? (5,2)

Ross

I believe the answer is:

chime in

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'add' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps you can see a link between them that I don't see?

'one's ringing tones to the conversation?' is the wordplay.
I cannot quite see how this works, but
'one's' could be 'im' ('one is' is a formal way of saying 'I am') and 'im' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for chime in that I've seen before include "Interject a remark" , "Interrupt" .)

I've seen this clue in The Globe and Mail.
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