Related Clues:

• To sharpen pen is an extremely good policy, it's said
• Purple-flowered cruciferous plant
• Polish animal housing of reputable quality
• Growing integrity
• Plant providing nectar across the street
• To sharpen pen is the best policy
• A plant in truth!
• 'The best policy'
• Frankness to rectify bluntness of enclosure
• Optimal policy, darling, when receiving Valentine, say
• I can't believe you left out a plant
• A virtue that's easily cultivated
• Get keen on messy place coming clean
• Secluded home in Orkney island getting the best policy?
• The best policy, supposedly