Juliet in kiss curse (4)
I believe the answer is:
jinx
'curse' is the definition.
(I know that curse can be written as jinx)
'juliet in kiss' is the wordplay.
'juliet' becomes 'J' (phonetic alphabet: alpha, bravo, charlie etc.).
'kiss' becomes 'x' (X can represent a kiss).
'j'+'in'+'x'='JINX'
(Other definitions for jinx that I've seen before include "Thing or person that brings bad luck" , "Evil spell" , "Person or thing thought to bring bad luck" , "Curse" , "Bringer of bad luck" .)