Ban this person returning British ship built long ago (7)
I believe the answer is:
embargo
This clue could be a double definition.
'ban' is the first definition.
(I know that embargo is a kind of ban)
'this person returning british ship built long ago' is the second definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for embargo that I've seen before include "Proscribe, ban" , "Legal stoppage of commerce" , "Block" , "Trading ban" , "Commercial ban" .)