Yam (5,6)
I believe the answer is:
sweet potato
'yam' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sweet potato that I've seen before include "Edible root of the Americas" , "Tropical root vegetable" , "Yam-like vegetable" , "Paste too wet (anag.)" , "South American vegetable" .)