Flow like molasses (4)
I believe the answer is:
ooze
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flow like molasses</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 ooze that I've seen before include "Slime" , "nap" , "Gentle flow" , "River-bed mud; leak slowly" , "Exude mud" .)