Training exercise (5)
I believe the answer is:
drill
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">training exercise</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for drill that I've seen before include "strong twilled cotton" , "Tool for boring holes" , "Instruct" , "Military training; bore" , "Twilled cotton; soldiers' exercise" .)