Move about stealthily (5)
I believe the answer is:
prowl
'move about stealthily' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for prowl that I've seen before include "Move about with unlawful intentions" , "Move stealthily around" , "Skulk" , "Move stealthily (as tiger)" , "Move as if seeking prey" .)