Possible Clues:

• Why you cut down on beer?
• The explanation for a relation misbehaving
• Reason to be miserly as a landlord?
• Reasons (for an action)
• This might account for booze being found on allotment
• Only so much beer per person is the reasoning behind this (9)
• Share drink? That’s the thinking
• Motivation for provision of drink
• The logic behind share sales excluding outsiders
• A relation's ground, or grounds