Use a stencil on
I believe the answer is:
trace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">use a stencil on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for trace that I've seen before include "a little bit" , "Small quantity; find" , "Detect - track" , "Evidence" , "Follow and find" .)