Crossword Genius

Beer served with tuna one ordered in these islands? (8)

Ross

I believe the answer is:

aleutian

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'these islands?' is the definition.
The definition suggests an adverb but the answer is not.

'beer served with tuna one ordered' is the wordplay.
'beer' becomes 'ale' (type of beer).
'served with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'ordered' indicates anagramming the letters.
'tuna'+'i'='tunai'
'tunai' anagrammed gives 'utian'.
'ale'+'utian'='ALEUTIAN'

'in' acts as a link.

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I've seen this clue in The Independent.
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