Impose (a tax) (4)
I believe the answer is:
levy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impose a tax</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 levy that I've seen before include "Tax, fee, fine, etc" , "enlisted troops" , "Imposition of charge" , "draft" , "Financial charge" .)