Vitality, zip (4)
I believe the answer is:
zing
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">vitality</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">zip</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for zing that I've seen before include "spirit" , "Get-up-and-go" , "Go" , "Vigour" , "Energy - high-pitched buzz" .)