Alters his stance in area of Scotland (9)

I believe the answer is:

caithness

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'area of scotland' is the definition.
The definition suggests a singular noun which matches the answer.

'alters his stance' is the wordplay.
'alters' indicates an anagram.
'his'+'stance'='hisstance'
'hisstance' is an anagram of 'CAITHNESS'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for caithness that I've seen before include "Area in the far north of Scotland" , "Northernmost region of mainland Scotland" , "Area of north-eastern Scotland" , "Highland area" .)

I've seen this clue in The Irish News.

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