Root in Polynesian cuisine (4)
I believe the answer is:
taro
'root in polynesian cuisine' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for taro that I've seen before include "Shortly pack" , "Starchy food" , "Tropical plant with edible tuberous roots" , "Root to eat" , "Fortune-telling cards" .)