Possible Clues:

• 24 across, something to catch, to catch, you heard, given success, caught
• Sounds as if the vehicle is green with age
• Head of the produce section?
• A Brassica plant
• Beg a cab to take the vegetable
• In which hardness of heart is a virtue?
• Vegetable with dense head of leaves
• Veg box left outside a B&B
• Vegetable, all of whose parts are in scale
• Teenage Fanclub "The ___"