Knight on this tour ransacked Scottish island (5,4)

I believe the answer is:

north uist

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'scottish island' is the definition.
The definition suggests a singular noun which matches the answer.

'knight on this tour ransacked' is the wordplay.
'knight' becomes 'n' (chess abbreviation).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'ransacked' indicates anagramming the letters.
'this'+'tour'='thistour'
'thistour' with letters rearranged gives 'orthuist'.
'n'+'orthuist'='NORTH UIST'

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I've seen this clue in The Times.

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