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' is a reversal indicator (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" .)