Related Clues:

• 'I'll get back to you'
• "I'll get back to you"
• 'I could do both'
• Some mistake by ambassador reversed, perhaps
• English 12 — one or the other
• Whichever of the two
• One in three, possibly, or one of two
• One of two slithered dropping LSD
• 1 of 2 or 1 in 3, roughly?
• Medal a Yankee wears, perhaps
• 'Let me sleep on it'
• "Let me sleep on it"
• The one or the other unit covered in solvent
• 'Whichever works'
• Regulars in navy, inspired by honour — it's a possibility