Interrupts in ringing tones? (6,2)
I believe the answer is:
chimes in
'interrupts in ringing tones?' is the definition.
'chimes in' can be an answer for 'interrupts' (chiming in is a kind of interrupting). I am not certain of the 'in ringing tones?' bit.
'interrupts in' is the wordplay.
'interrupts' becomes 'chimes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'chimes'+'in'='CHIMES IN'
Can you help me to learn more?
(Another definition for chimes in that I've seen is " Expresses agreement - joins the discussion".)