Possible Clues:

• Reasonable serving man in the neighbourhood hostelry
• Record one short visit that's reasonable
• It's reasonable for an American soldier to enter pub
• It follows US soldier into the pub
• Stands to, re a son
• According with reason
• Soldier found in pub? Stands to reason!
• Correctly reasoned, makes sense
• Is it reasonable to be private in public house?
• Rational in thought