Peck on the cheek (4)
I believe the answer is:
kiss
'peck on the cheek' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kiss that I've seen before include "Eg, smacker, peck" , "Snog" , "Greet with lips" , "Act of osculation" , "Cross" .)