A succeeding island state? (4)
I believe the answer is:
iowa
'state?' is the definition.
(I know that Iowa is a state)
'a succeeding island' is the wordplay.
'succeeding' is a charade indicator (letters next to each other) (succeeding can mean going after or following).
'island' becomes 'iow' (abbreviation for Isle of Wight).
'a' after 'iow' is 'IOWA'.
(Other definitions for iowa that I've seen before include "Midwest US state" , "American state, capital Des Moines" , "US swing electoral state" , "State of USA" , "US state, capital Des Moines" .)