Move in a stream (4)
I believe the answer is:
flow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">move in a stream</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for flow that I've seen before include "Move along as a stream" , "Uninterrupted stream" , "Current" , "Run smoothly" , "Steady continuous stream" .)