Stand in the shadows (4)
I believe the answer is:
lurk
'stand in the shadows' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lurk that I've seen before include "Wait in ambush" , "Hide menacingly" , "Hide or wait stealthily" , "Behave in a sneaky and secretive manner" , "Skulk, hide" .)