Old flame with strong wine and strong beer (6)
I believe the answer is:
export
'strong beer' is the definition.
(I've seen this before)
'old flame with strong wine' is the wordplay.
'old flame' becomes 'ex' (an ex-lover).
'with' means one lot of letters go next to another.
'strong wine' becomes 'port' (strong type of wine).
'ex'+'port'='EXPORT'
'and' acts as a link.
(Other definitions for export that I've seen before include "Sell goods abroad" , "Send to another country" , "Item sent abroad" , "ship overseas" , "Sell or transfer abroad" .)