Talk of getting change for a groat! (5)
I believe the answer is:
argot
'talk' is the definition.
(I have seen 'Talk of thieves' mean 'argot' so perhaps 'talk' could also mean 'argot')
'getting change for a groat' is the wordplay.
'groat' can be anagrammed to 'ARGOT'.
However, I'm unsure how this is indicated.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for argot that I've seen before include "Cant" , "Criminal jargon" , "Father or mother" , "Jargon - patois" , "Jargon or slang (of a group)" .)