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