Colouring stick (6)
I believe the answer is:
crayon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">colouring stick</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crayon that I've seen before include "Colouring pencil" , "alternative to charcoal" , "Source of colour" , "One colours with this" , "Wax pen" .)