Possible Clues:

• Flee around the North at the double for Herb
• A herb
• Feel weedy around Dublin, by the sound of it
• Yellow-flowered plant with aromatic fruits
• Vegetable resembling celery
• For a flavour, how does one feel about Dublin, by the sound of it
• Culinary bulb
• Italian sausage flavoring
• Weedy Leonard turns up after it's all 4 down
• Feel that one is planted around the North at the double