Skilful revolutionary island (4)
I believe the answer is:
elba
'island' is the definition.
(Italian island)
'skilful revolutionary' is the wordplay.
'skilful' becomes 'able' (I've seen this before).
'revolutionary' says the letters should be written backwards (letters revolve around).
'able' back-to-front is 'ELBA'.
(Other definitions for elba that I've seen before include "Island where Napoleon was exiled" , "Napoleonic island" , "Island off Tuscany" , "Island of Napoleon's exile in 1814-15" , "Island of Napoleon's first exile" .)