Possible Clues:

• *Freebie from the hygienist
• Piece of gear to groom canines?
• It helps clean the word in the circled squares (as well as the alternate version)
• One found in toilet bag cocaine and heroin before confrontation
• It's as well flier has concealed British kind of moustache
• Further book penned by singer's a little cleaner
• Also spotted singer keeping book cleaner
• Freebie from a dentist
• Type of moustache that's inclined to collect pieces of food?
• Excessively black bird taken round for cleaner