Possible Clues:

• White-rooted biennial
• Sucrose-rich root veggie
• Sweet vegetable
• Sweet vegetable with white roots (2 words)
• But don't expect it to have a cube root!
• As beer gut wobbles, something sweet in that
• Suspect grubs ate hedges close to vegetable crop
• Vegetable in barge converted into fat
• Nasty grub eats last of the root crop
• Plant used to sweeten retro tomato sauces -- mash soundly