Vigorous, active (9)
I believe the answer is:
energetic
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">vigorous</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">active</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ ></span>
(Other definitions for energetic that I've seen before include "High-powered" , "'Animated, full of life (9)'" , "Forceful, vigorous" , "Full of go" , "Brisk" .)