Walk lightly (6)
I believe the answer is:
tiptoe
'walk lightly' 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 "Walk delicately - musically through the tulips" , "Walk silently" , "Walk very quietly, in song through the tulips" , "Go carefully" , "Walk stealthily" .)