undercover (9)
I believe the answer is:
incognito
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">undercover</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for incognito that I've seen before include "With one's identity concealed" , "In disguise" , "hiding identity" , "with unknown identity" , "On the sly" .)