Possible Clues:

• Honour given to copper twice right for being as cool as this
• Vegetable hamper collecting muck in the middle
• Green ingredient in raita
• See 47-Across
• Samuel Johnson said this should be sliced, dressed with pepper and vinegar, then thrown out as good for nothing
• Long green fruit for salads
• Two coppers, married, live on river: it's cool
• Cylindrical green fruit
• Cool salad vegetable
• Vine fruit's colour originally between copper and brown