Incitement involves couple (4)
I believe the answer is:
item
'couple' is the definition.
(a romantic couple are 'an item')
'incitement involves' is the wordplay.
'involves' says the answer is hidden in the clue.
'ITEM' is hidden within 'incitement'.
(Other definitions for item that I've seen before include "pair?" , "Bit of news to broadcast" , "Syrian capital" , "Separate object or unit" , "Whole individual unit" .)