Ban poetic entreaty to hold me back (7)

I believe the answer is:

embargo

'ban' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for embargo that I've seen before include "Admiralty order" , "restrict trade" , "Official ban or blockade on trade" , "Official prohibition as on trade" , "Stop" .)

I've seen this clue in The Guardian.

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