Alleviation of pain (6)
I believe the answer is:
relief
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alleviation of pain</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 relief that I've seen before include "Lightening of a burden" , "Assistance given to people in need" , "Cosmos" , "A lessening of pressure" , "Easement from pain or distress" .)