Thin mud (4)
(Other definitions for silt that I've seen before include "Slimy mud" , "Mud deposit in a river" , "Mud deposited in a river or lake" , "Sediment deposited by a river" , "Fine sediment (often deposited by water)" .)
(Other definitions for slurry that I've seen before include "Liquid manure as fertiliser" , "Semi-liquid mixture containing manure, cement or coal, for example" , "Water mixed with clay, lime etc" , "Liquid waste from farm animals" , "Semi-liquid mixture of water and cement or manure, say" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thin mud</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 slime that I've seen before include "could make things sticky" , "Sludge, gloop" , "Gunge" , "Gooey seeping stuff" , "Gunk" .)