Smooch (4)
I believe the answer is:
kiss
'smooch' is the definition.
(I know that smooch can be written as Kiss)
This is all the clue.
(Other definitions for kiss that I've seen before include "Neck - peck" , "Smack; peck" , "Peck (on cheek or lips?)" , "Salute" , "Expression of love" .)