Secretive (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">secretive</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 stealthy that I've seen before include "'Sneaky, clandestine (8)'" , "Done in a quiet or secretive way" , "Acting in furtive or covert manner" , "Moving surreptitiously" , "Acting in quiet or secret way" .)