Should (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">should</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ought that I've seen before include "Tough (anag)" , "Have/has a duty (to do)" , "It expresses duty or obligation" , "outdated anything at all?" , "Be bound" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">should</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>
(Another definition for ought to that I've seen is " Should".)