Seized area captured by whirling Dervish (8)

I believe the answer is:

ravished

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'seized' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

'area captured by whirling dervish' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'captured by' indicates putting letters inside.
'whirling' is an anagram indicator.
'dervish' is an anagram of 'rvished'.
'a' put inside 'rvished' is 'RAVISHED'.

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I've seen this clue in The Telegraph.

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