Language in the borders of Surrey full of jargon? (6)

I believe the answer is:

slangy

'full of jargon?' is the definition.

'language in the borders of surrey' is the wordplay.
'language' becomes 'lang' (**).
'in the' is an insertion indicator.
'borders of' says to hollow out the word (remove centre letters).
'surrey' with its centre taken out is 'sy'.
'lang' inserted inside 'sy' is 'SLANGY'.

I've seen this clue in The Telegraph.

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