Possible Clues:

• It makes sense to include drink
• Calculates 50 per cent of 13 -- drink needed!
• Nothing odd about bard -- ode's well versed and makes sense
• A drink involving big cups makes sense
• Stands to reason dad brewed drink
• Notice May's supporters keeping close to Boris does make sense
• Makes 22-Across
• Bills increased when housing daughter -- makes sense
• A dashed decanted drink makes sense
• Makes sense for tots