Cogent (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cogent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for valid that I've seen before include "Legally acceptable, unexpired" , "Legally in force" , "Sound and to the point, also legal" , "Effectual" , "Still legally acceptable" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cogent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>