Move quietly (6)
I believe the answer is:
tiptoe
'move quietly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tiptoe that I've seen before include "Move delicately" , "Go lightly and stealthily" , "Lightly pad" , "Walk very carefully" , "''... through the tulips'' (Tiny Tim song)" .)