Possible Clues:

• The root of this ids that he may be a quack and will quack
• Naked arm (anag) - narcotic plant
• Plant discovered by grown-up explorer
• Plant fellow dislodged finally with garden tool
• Maiden with rouz, one said to shriek when picked out?
• A plant; mean, dark (anag.)
• Would this get to the root of him that's so ducky? (8)
• Root used in medicine
• What a ducky chap to have been thought to have magic powers!
• Chap getting duck? One screams when got out