Drill; activity (8)
I believe the answer is:
exercise
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">drill</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that drill can be written as exercise)</span><br/ ><br/ >'<span class="explanation-format__original">activity</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that exercise is a type of activity)</span><br/ ><br/ ></span>
(Other definitions for exercise that I've seen before include "Do it to get fit" , "problem" , "Physical exertion for keeping fit" , "Practice session" , "Exertion to develop fitness" .)