Composer in Cuba cheated (4)
I believe the answer is:
bach
'composer' is the definition.
(Johann Sebastian Bach)
'in cuba cheated' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BACH' can be found hidden inside 'cuba cheated'.
(Other definitions for bach that I've seen before include "Affectionate address" , "JS --, baroque composer" , "Johann Sebastian . . . . , great composer (4)" , "musical great" , "Musical family" .)