Uncomplaining person (5)
I believe the answer is:
stoic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">uncomplaining person</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 stoic that I've seen before include "Seeming unaffected by pleasure or pain" , "One who endures pain with equanimity" , "Resigned" , "One patient under misfortune" , "Phlegmatic type" .)