Tuber that can be candied (3)
I believe the answer is:
yam
'tuber that can be candied' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yam that I've seen before include "Tropical tuber" , "A starchy tuber" , "Potato-like vegetable" , "American sweet potato" , "Edible root" .)