Possible Clues:

• Party ignores leader of the opposition from clip lacking sensitivity in the plant
• Tree makes a blaze in heart of clump
• Foreign article set on fire for expressing hesitation for poisonous type found in 14 across
• Plant with hanging clusters of bright yellow flowers
• Poisonous flowering shrub — run album (anag)
• Poisonous tree or shrub, a native of the Alps
• Foreign article set on fire with hesitation by poisonous type found in 14 across
• Shrub known as golden chain
• Tree with yellow flowers and poisonous seeds
• American, smart feeding pollarded fruit tree