Drinking chocolate (5)
I believe the answer is:
cocoa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drinking chocolate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cocoa that I've seen before include "Nighttime drink" , "Chocolaty drink" , "Evening drink taken in rococo amphitheatre" , "Reddish brown" , "Hot brown drink" .)