Related Clues:

• Lined up
• Ranked
• Side by side
• Straight, after 'in'
• Forming ranks
• 'And pretty maids all in ___'
• Get one's ducks in ___
• Get one's ducks in ---
• ''... and pretty maids all in ---''
• Three in ---
• In ___ (aligned)
• Queued up
• In ___ (consecutively)
• "... pretty maids all in ___"
• Three-in-___