Lively, nimble (4)
I believe the answer is:
spry
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lively</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">nimble</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that nimble can be written as spry)</span><br/ ><br/ ></span>
(Other definitions for spry that I've seen before include "Far from doddering" , "Nimble (for one's age?)" , "Quick and agile" , "(Of an old person) lively" , "Sprightly" .)