Took advantage of (4)
I believe the answer is:
used
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">took advantage of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for used that I've seen before include "was milking" , "No longer pristine" , "That's not new" , "worked unfairly" , "Put to a purpose" .)