Mean to have a drink at last (7)
I believe the answer is:
portend
'mean' is the definition.
(thesaurus)
'a drink at last' is the wordplay.
'a drink' becomes 'port' (port is a kind of drink).
'at' means one lot of letters go next to another.
'last' becomes 'end' (I've seen this in another clue).
'port'+'end'='PORTEND'
'to have' acts as a link.
(Other definitions for portend that I've seen before include "Foreshadow" , "Threaten" , "forecast" , "Signal" , "Betoken; presage" .)