Related Clues:

• Mull over, with ''on''
• Live (in)
• Harp
• Harp (on)
• Consider, with 'on'
• Have some gum
• '___ your food' (mother's admonition)
• Copenhagen, e.g.
• Consider (with "over")
• Enjoy, as gum
• __ the fat
• __ toy (pet shop item)
• What mirrors do
• Work on a piece of gum
• Work on a wad of gum