Old wine in ship overseas? (6)
I believe the answer is:
export
'ship overseas?' is the definition.
(I've seen this before)
'old wine' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'wine' becomes 'port' (port is a kind of wine).
'ex'+'port'='EXPORT'
'in' acts as a link.
(Other definitions for export that I've seen before include "Dispose of to another country" , "Carry out of country" , "Send (goods) overseas" , "Sell or transfer abroad" , "Send goods for sale abroad" .)