Mary Jane (3)
I believe the answer is:
pot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mary jane</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that mary jane can be written as pot)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pot that I've seen before include "Storage container" , "Sink (a snooker ball)" , "Kitty; marijuana" , "Street name for cannabis" , "It sometimes calls the kettle black" .)