Variety of beet with large leaves and thick stalks (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
chard
(Other definitions for chard that I've seen before include "Type of beet" , "salad" , "Seakale beet" , "Kind of (Swiss?) beet with edible leaves" , "Vegetable; Somerset town" .)