Keen relish (5)
I believe the answer is:
gusto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">keen relish</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gusto that I've seen before include "Spirit" , "Zest and enjoyment in doing something" , "Showing zest" , "Hearty enjoyment" , "Vigorous and enthusiastic enjoyment" .)