Related Clues:

• A cube has one
• Yam or turnip
• Carrot, e.g
• Fundamental cause
• Firmly establish sound course
• Derivation
• Source of river also running westward
• Solution of equation produces cheer
• Rummage, origin
• As well to run back to burrow
• Basic source or origin
• Origin; eg, carrot
• Part of a tree
• In auditorium, course reveals essential nature
• Measure of support