Spirit, temperament (6)
I believe the answer is:
mettle
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">spirit</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that mettle is a type of braveness)</span><br/ ><br/ >'<span class="explanation-format__original">temperament</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for mettle that I've seen before include "Spirit, resilience" , "Bravery" , "Spirit could sound like iron, say" , "boldness" , "Courage sounds like iron, for instance" .)