Italian island having strength for revolution (4)

I believe the answer is:

elba

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'italian island' is the definition.
(Elba is an Italian island)

I can't explain the rest of the clue.

(Other definitions for elba that I've seen before include "Island off Italy" , "Napoleonic island" , "Napoleon's prison isle" , "Island off Tuscany" , "Island of imperial exile" .)

I've seen this clue in The Times.

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