A drink and I, following, wreck the can (7)
I believe the answer is:
martini
'a drink' is the definition.
(martini is a kind of drink)
'i following wreck the can' is the wordplay.
'following' means one lot of letters go next to another.
'wreck' becomes 'mar' (I've seen this in another clue).
'the can' becomes 'tin' (both are metal containers).
'mar'+'tin'='martin'
'i' after 'martin' is 'MARTINI'.
'and' is the link.
(Other definitions for martini that I've seen before include "James Bond's drink of choice" , "tipple" , "Sienese painter" , "Type of Italian vermouth" , "Alternative name for Simone Memmi, pre-Renaissance Italian painter" .)