Chat's dropped at change of service provider? (10)
I believe the answer is:
conversion
'change of service provider?' is the definition.
'conversion' can be an answer for 'change' (conversion is a kind of change). I am not sure about the 'of service provider?' bit.
'chat's dropped at' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for conversion that I've seen before include "necessary to achieve a goal" , "Paul's Damascene experience" , "change of heart" , "Religious experience" .)