Send abroad for the old left! (6)
I believe the answer is:
export
'send abroad' is the definition.
'the old left' is the wordplay.
'the old' becomes 'ex'.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'ex'+'port'='EXPORT'
'for' acts as a link.
(Other definitions for export that I've seen before include "Item sent abroad" , "Sell goods abroad" , "Send goods for sale abroad" , "Sell or give to another country" , "Send (goods) overseas" .)