Possible Clues:

• City parking, say, alongside pub in Mayfair
• Alias YWG
• Capital of Manitoba, Canada (8)
• City nicknamed Gateway to the West
• Secure a little drink, say, in North American city
• Get hold of drink, say, in Canadian city
• City girl supporting pub in Mayfair
• ''Gateway to the West''
• Sixth largest Canadian lake
• Get shot, say, in 20