Hide furtively (4)
I believe the answer is:
lurk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hide furtively</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 lurk that I've seen before include "Read (but take no part in) online chat" , "keep low profile" , "View an online forum without contributing" , "Loiter with intent" , "Linger around furtively" .)