Popular rock group (4)
I believe the answer is:
kiss
'popular rock group' 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 "Peck (on cheek or lips?)" , "drop of wax" , "Expression of love" , "Touch lightly - a sign of affection" , "Smooch" .)