Not allowed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not allowed</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 taboo that I've seen before include "Not allowed, forbidden, proscribed" , "Socially prohibited" , "No-no" , "Inhibition based on social custom" , "Socially forbidden" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not allowed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for illegal that I've seen before include "Unlawful" , "Felonious" , "Wrong" , "Outlawed" , "Unauthorised" .)
(Another definition for inadmissible that I've seen is " Not to be tolerated".)