Woods in an unsettled area of Wales (9)

I believe the answer is:

snowdonia

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'area of wales' is the definition.
'snowdonia' can be an answer for 'area' (I have seen 'mountainous area' mean 'snowdonia' so perhaps 'area' could also mean 'snowdonia'). I am not certain of the 'of wales' bit.

'woods in an unsettled' is the wordplay.
'unsettled' is an anagram indicator.
'woods'+'in'+'an'='woodsinan'
'woodsinan' with letters rearranged gives 'SNOWDONIA'.

Can you help me to learn more?

(Other definitions for snowdonia that I've seen before include "National park in Wales" , "Welsh mountain area" , "somewhere in 10" , "alpine region" , "massif region" .)

I've seen this clue in The Guardian.

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