Forbids (4)
I believe the answer is:
bans
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">forbids</span>' is the definition.<br/ ><span class="explanation-format__explanation">(banning is a kind of forbidding)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bans that I've seen before include "Forbids" , "Officially prohibits" , "Prohibiting decree" .)