Formerly fortified wine and strong beer (6)
I believe the answer is:
export
'strong beer' is the definition.
(I've seen this before)
'formerly fortified wine' is the wordplay.
'formerly' becomes 'ex'.
'fortified wine' becomes 'port' (port is a kind of fortified wine).
'ex'+'port'='EXPORT'
'and' is the link.
(Other definitions for export that I've seen before include "Sell goods abroad" , "Item sent abroad" , "Dispose of to another country" , "Send goods for sale abroad" , "Carry out of country" .)