Isle, a state (4)

I believe the answer is:

iowa

'state' is the definition.
(I know that Iowa is an American state)

'isle a' is the wordplay.
'isle' becomes 'iow' (abbreviation for Isle of Wight).
'iow'+'a'='IOWA'

(Other definitions for iowa that I've seen before include "Midwest US state" , "American state, capital Des Moines" , "part of United States" , "US state, capital Des Moines" , "State of USA" .)

I've seen this clue in The Independent and The Telegraph.

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