Barge, after being unloaded? (7)
I believe the answer is:
lighter
'barge' is the definition.
(I know that lighter is a type of barge)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for lighter that I've seen before include "Barge; igniter" , "relieved of some cargo?" , "Tender, launch" , "smoker may resort to it" , "Substitute for match" .)