Clamour to play with Haydn, in this state? (4,8)

I believe the answer is:

dual monarchy

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'this state?' is the definition.
The definition suggests a singular noun which matches the answer.

'clamour to play with haydn' is the wordplay.
'to play with' indicates anagramming the letters.
'clamour' with its letters anagrammed with 'haydn' gives 'DUAL MONARCHY'.

'in' acts as a link.

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I've seen this clue in The Times.

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