Zealous, impassioned (6)
I believe the answer is:
fervid
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">zealous</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">impassioned</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that impassioned can be written as fervid)</span><br/ ><br/ ></span>
(Other definitions for fervid that I've seen before include "Intensely passionate" , "Fiery and passionate" , "Intensely enthusiastic" , "Zealous" , "Heated - vehement" .)