Go very quietly (6)
I believe the answer is:
tiptoe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go very quietly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tiptoe that I've seen before include "Walk delicately - musically through the tulips" , "Estrange" , "Move with stealth" , "go quietly" , "Go gently" .)