Maybe change language and use power of persuasion (6,6)

I believe the answer is:

silver tongue

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'use power of persuasion' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'maybe change language' is the wordplay.
'maybe change' becomes 'silver' (silver coins, bits of change. I am not sure about the 'maybe' bit.).
'language' becomes 'tongue' (tongue can mean a language).
'silver'+'tongue'='SILVER TONGUE'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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