Related Clues:

• Underground stem
• ___ canal
• The underlying cause
• Etymologist's concern
• Herbicide target
• Extirpate, with 'out'
• Canine support
• Fans do it
• Motive for action
• Part of a tooth
• It engages in underground activity
• Tree's anchor
• Plant holder?
• Poke (around)
• Word after ginger or square