Turnip-like root vegetable (8)
I believe the answer is:
celeriac
(Other definitions for celeriac that I've seen before include "Edible root for Alec Rice" , "It has a root like a turnip" , "Turnip-rooted celery" , "Odd root vegetable for Alec Rice" , "Clear ice (anag) - it is used as a vegetable" .)