Related Clues:

• Sappy substance
• Source of maple syrup
• Maple yield
• It runs up trees
• Sappy stuff
• Syrup-to-be
• Not the brainiest sort
• Drain of energy
• Tree product
• Tree's blood
• Drain of strength
• It's appetizing to aphids
• Deplete, as energy
• ''Jurassic Park'' mosquito preserver
• It may be found in a trunk