Related Clues:

• Plant with leaves all year round
• Holly is permanently jealous!
• Scots pine, perhaps, when English politician secures rise for minister
• Always jealous, having no garden shed?
• Ageless English minister about to join another party?
• Continually fresh
• Having an enduring freshness
• Such traffic lights would be having enduring popularity
• Always popular bit of work with Scripture occupies still
• Enduringly popular
• Standard is incessantly naive
• The foliage of the trees remains throughout the year
• Like a Christmas tree
• Never leaves off, always retaining its vitality
• Not going brown, so maybe pine