Quack medicine (7)
I believe the answer is:
nostrum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quack medicine</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nostrum that I've seen before include "Simple, remedy" , "Quack medicine - run most (anag)" , "answer to all problems!" , "Supposed remedy" , "Panacea or cure-all" .)