Drinking and engaging in amorous activity? (7)
I believe the answer is:
necking
This clue is a double definition.
'drinking' is the first definition.
(to neck a drink is to swallow it)
'engaging in amorous activity?' is the second definition.
(necking can informally mean kissing)
'and' acts as a link.
(Other definitions for necking that I've seen before include "part of capital" , "Petting (sl.)" , "Canoodling" , "Swallowing" , "Downing" .)