Related Clues:

• Ultimate cause
• Rummage for truffles, e.g.
• Darwin's "The __ of Species"
• Support, with "for"
• Show bias
• Carrot or radish
• Reptile
• 10-Down target
• Underground plant part
• Word with ''ginger'' or ''square''
• Beginning point
• Dental canal
• Shout 5 Down, maybe
• Fountainhead
• Show support