Crossword Genius

Italian agreement reversed by the French in Corsica? (4)

Ross

I believe the answer is:

isle

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'corsica?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'italian agreement reversed by the french' is the wordplay.
'italian agreement' becomes 'si' ('yes' in Italian).
'reversed' shows that the letters should be reversed in order.
'by' says to put letters next to each other.
'the french' becomes 'le' (**).
'si' written backwards gives 'is'.
'is'+'le'='ISLE'

'in' is the link.

Can you help me to learn more?

(Other definitions for isle that I've seen before include "See 10 Down" , "Land amid water" , "-- of Ely, Dogs, Man" , "A poetic island" , "Anglesey, say" .)

I've seen this clue in The Telegraph.
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