Possible Clues:

• Nothing to impress me, lifting prohibition
• Official ban or blockade on trade
• I welcome motorway pub stop
• Consequently accepting a management degree presents a barrier
• (Trade) ban
• See half of them black old ship in restrictive action at port
• Prohibition makes them make the pub be no more
• Block my turn with instruction to go to bar
• Sanction flickering of amber before green
• Drug discovered by docked boat involved in instant ban