Possible Clues:

• New pro — he wins title
• Runs club, for instance, from Post Office perhaps? Indeed one can prove it!
• Proprietor's status
• It can pass when you pass
• Possession when pro is involved
• One must have to have it!
• Title indication
• Possession of unopened tranquillisers and joint
• Attribute evident when one has a certain something?
• Legal possession