Possible Clues:

• You'd never get a single one like this
• That's how Al gets the Guard to be in small stages
• One breaks service but ace squandered in fluff
• Not notice
• See 25-Across
• Waste ammo, say
• Feel the loss of — schoolgirl
• Girl or unmarried woman
• One is as good as a mile
• Fail to notice letter I've dropped