Tobacco user (6)
I believe the answer is:
smoker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tobacco user</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for smoker that I've seen before include "parrot!" , "Addict perhaps" , "Tobacco user" , "part of train once" , "one cures" .)