Related Clues:

• A penny once lost from board game played in bar
• Prohibition? I've kept my head about it
• Block my turn with instruction to go to bar
• Blockage of a sort
• Trade barrier
• Order intended to prevent trade
• An order to stop amber changing to green?
• Check on trade
• Complete shutout?
• Prohibit European doctor going on legendary vessel
• Government trade ban
• Doctor in English ship showing restraint
• Commercial break so captivating trained businessman
• Almost board ship before travel prohibition
• Prohibition raises nothing to catch my interest