Hard stuff (5)
I believe the answer is:
booze
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hard stuff</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 booze that I've seen before include "Drink too much (colloq.)" , "Drink to excess (colloq.)" , "sauce" , "Alcohol (sl.)" , "plonk?" .)