Island’s heavenly sign when corn has been cut (5)

I believe the answer is:

capri

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'island's' is the definition.
(Italian island)

I don't understand the rest of the clue.

(Other definitions for capri that I've seen before include "Italian isle" , "Island home of G. 24" , "Romantic and expensive island in Bay of Naples" , "Tourist destination" , "I carp about the island" .)

I've seen this clue in The Times.

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