Eager or zealous (4)
I believe the answer is:
avid
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">eager</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">zealous</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for avid that I've seen before include "hungry" , "Keenly interested" , "deeply enthusiastic" , "Keen, enthusiastic" , "Greedy like diva" .)