Overextend (3)
I believe the answer is:
tax
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">overextend</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tax that I've seen before include "Impost" , "Government imposition" , "Demand" , "Put pressure on like Revenue Commissioners?" , "Levy; make demands on" .)