Narcotic drugs (7)
I believe the answer is:
opiates
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">narcotic drugs</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 opiates that I've seen before include "Sedative drugs" , "Narcotic drugs" , "Makes dull" , "Is a poet (anag.)" , "Branch of narcotics" .)