Related Clues:

• Opinion piece
• Plant product
• Put in the mail
• It's often lower than dirt
• Open position?
• Drop in the mail
• Propagative part of a plant
• Affix for public notice
• Either end of a gate
• Sesame product
• Mail delivery, to Brits
• Edible sunflower part
• Canary snack
• Future flower
• It may be for the birds