Drew on (4)
I believe the answer is:
used
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drew on</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 used that I've seen before include "Enjoyed" , "Employed in task, or second-hand" , "Put to a purpose" , "Previously owned by another" , "Second-hand, not new" .)