Possible Clues:

• Unusual description of sick policeman?
• Unusual location for the rest of the constabulary
• Unusual when Bobby isn't on his round
• Far-out
• Whack-whack-whacky
• Unusual round after start
• Rather unconventional
• Wacky, like bobby transferred to desk job
• Kooky
• Rotten vegetable, you say? That's odd