Possible Clues:

• 'A . . . . . . . . sweeps clean'
• Just-appointed manager who’s eager to shake things up
• It sweeps clean
• Genista Nova for the sweep?
• ''A ... ..... sweeps clean''
• How one might make a clean sweep of Genista Nova, perhaps
• Genista Nova, perhaps, for the sweep
• Fresh in the shrubbery, it's enough to make the sweep clean
• No veteran expected to achieve a clean sweep
• One might brew it for the sweep in the Moon up there