Fermentation sediment (4)
I believe the answer is:
lees
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fermentation sediment</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 lees that I've seen before include "Sediment that settles at the bottom of wine" , "worst part" , "Grounds" , "Sediment from fermentation of alcohol" , "Knock back these dregs of liquor" .)