Canny cost adjuster? (4)

I believe the answer is:

scot

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'adjuster?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'canny cost' is the wordplay.
'cost' can be anagrammed to 'SCOT'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for scot that I've seen before include "Highlander perhaps" , "Ancient tax" , "Northern member of UK" , "one from the North of Britain" , "Rabbie Burns, for instance" .)

I've seen this clue in the Evening Standard.

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