Laver crazy? Service with a copper in jargon? (10)

I believe the answer is:

vernacular

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'jargon?' is the definition.
(I know that argot can be written as vernacular)

'laver crazy? service with a copper in' is the wordplay.
'crazy?' is an anagram indicator (I've seen 'crazy' mean this).
'service with' becomes 'rna' (I can't explain this - if you can you should believe this answer much more).
'a copper' becomes 'cu' (chemical symbol).
'in' indicates putting letters inside.
'rna'+'cu'='rnacu'
'laver' anagrammed gives 'velar'.
'velar' enclosing 'rnacu' is 'VERNACULAR'.

Can you help me to learn more?

(Other definitions for vernacular that I've seen before include "Characteristic language" , "Native tongue - dialect" , "Everyday language" , "Native language" , "Local-style" .)

I've seen this clue in the Sydney Morning Herald.

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