Sugar source (4)
I believe the answer is:
cane
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sugar source</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cane that I've seen before include "Bamboo rod" , "Beat - bamboo - stick" , "A light rod once used for punishment" , "Bamboo, sugar, stem" , "Birch" .)