Conspiring group in Corsica balloted (5)
I believe the answer is:
cabal
'conspiring group' is the definition.
(I've seen this before)
'in corsica balloted' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CABAL' is hidden in the letters of 'corsica balloted'.
(Other definitions for cabal that I've seen before include "Intriguing group" , "Secret political clique or faction" , "Small group of (eg political) plotters" , "Group in plot" , "Group of conspirators" .)