Walk stealthily (6)
I believe the answer is:
tiptoe
'walk stealthily' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tiptoe that I've seen before include "Creep" , "or get a bit higher on this?" , "Estrange" , "Go lightly and stealthily" , "Move delicately" .)