Busy, engaged (8)
I believe the answer is:
occupied
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">busy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">engaged</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for occupied that I've seen before include "Inhabited, held" , "Employed" , "In enemy hands" , "Seized and controlled by military invasion" , "Filled a space, time or position" .)