Skulk (4)
'skulk' is the definition.
(synonyms)
This is all the clue.
(Other definitions for lurk that I've seen before include "Hang around furtively" , "Hang around in a secretive way" , "keep low profile" , "Wait in ambush" , "View an online forum without contributing" .)
'skulk' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sneak that I've seen before include "Creep" , "Petty informer" , "Underhanded tell-tale" , "Slink, skulk; tell tales" , "Prowl" .)
(Other definitions for creep that I've seen before include "jerk?" , "Inch" , "Cringing, unpleasant person (slang)" , "grovel" , "Sycophant" .)