Get used to a convention in conversation (8)
I believe the answer is:
accustom
'get used' is the definition.
(I've seen this before)
'a convention in conversation' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
'convention' could be 'custom' (I've seen this before) and 'custom' is found within the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for accustom that I've seen before include "Make familiar with" , "get one inured to" , "get used to" , "Adapt" , "Maybe reconcile" .)