Make obscure (9)
I believe the answer is:
obfuscate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make obscure</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for obfuscate that I've seen before include "Make obscure or unclear" , "Make dark" , "Make confused" , "Dim" , "Darken or obscure something" .)