Sadly no charms in this county resident (10)

I believe the answer is:

cornishman

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'this county resident' is the definition.
The definition suggests a singular noun which matches the answer.

'sadly no charms in' is the wordplay.
'sadly' indicates anagramming the letters.
'no'+'charms'+'in'='nocharmsin'
'nocharmsin' anagrammed gives 'CORNISHMAN'.

Can you help me to learn more?

(Another definition for cornishman that I've seen is " Westerner".)

I've seen this clue in The Independent.

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