Possible Clues:

• Likely losers having borderline personalities?
• They're not parts of circles
• I wouldn't bet on these 6 11
• They're alien diets forced into the one for us
• Nonmembers ... or what 4-, 7- and 10-Down lack?
• They're not in the in-crowd ... and read differently, what each starred answer has two of
• … possibly it rouses about five hundred aliens
• Those not in the loop
• Not one of the gang that's not in before the colour is up over the South
• Competitors or horses with little chance of winning - not in the club