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In retrospect, Aidan isn't finished taking credit for a pastoral setting (7)

Ross

I believe the answer is:

arcadia

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'pastoral setting' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for arcadia that I've seen before include "Tom Stoppard play" , "pastoral paradise" , "Idealised rural region" , "part of Greece" , "Jumbo manufacturer" .)

I've seen this clue in the Irish Times.
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