Sugar stalk (4)
I believe the answer is:
cane
'sugar stalk' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cane that I've seen before include "Bamboo, sugar, stem" , "Eg, bamboo; punish" , "Slender stick" , "A light rod once used for punishment" , "A slender rod, perhaps for punishment" .)