Kosher (5)
I believe the answer is:
legit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kosher</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for legit that I've seen before include "Reliable" , "allowed by law, shortly!" , "Honest (abbr)" , "Such theatre" , "Above board (abbr)" .)