Possible Clues:

• This won't 17 across you go to the pub with 'em
• Legal restraint
• Will this forbid them to the pub depart?
• Ban doctor boarding ship carrying drug
• If there's a ban for me to come back to the pub, then leave it
• Get me up to the pub and then go and impose Prohibition
• That'll stop them getting to the pub and then leave
• Ban 'em and take up nothing!
• Almost board ship before travel prohibition
• Ban (on trade)