Possible Clues:

• __ toy (pet shop item)
• Work on a wad of gum
• Scold, with "out"
• Work on a piece of gum
• What you do to 41-Across
• Use your teeth to cut off the end of it
• Grind this, see, and cut the end off it
• Grind with the teeth
• Take some tabacky
• Work or grind between teeth