Possible Clues:

• 'The Mikado' trio
• They "live and love," according to Zep
• They have clean-up positions
• They have cleanup positions
• Changers of 34-Across
• Men need them, according to Neil Young
• Yum-Yum, Peep-Bo and Pitti-Sing in 'The Mikado'
• Some domestic staffers
• Eight milkers in 'The 12 Days of Christmas'
• Broom wielders