"Slung" stuff (3)
I believe the answer is:
mud
'slung stuff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mud that I've seen before include "Alluvial deposit as in river bed" , "soft soil" , "-, -, Glorious - (Flanders and Swann)" , "Mire" , "Water-soaked soil" .)