Have a cigarette (5)
I believe the answer is:
smoke
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">have a cigarette</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 smoke that I've seen before include "Use tobacco" , "Use a cigarette" , "Visible vapour" , "cause of a cough?" , "Fume" .)