Possible Clues:

• One may cover your tab
• Wager over lager, say
• Test of consumer confidence?
• Songbird to flutter, chasing rail
• Something that might be settled over drinks
• Bird lay at back of pub
• One might be made over a beer
• Wager at the local? Very doggy!
• Wager over darts, e.g
• Wager made over beers