Skulks (6)
I believe the answer is:
prowls
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">skulks</span>' is the definition.<br/ ><span class="explanation-format__explanation">('prowl' can be a synonym of 'skulk')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for prowls that I've seen before include "Walks about stealthily" , "Moves stealthily or loiters about" .)