Residue or remains (5)
I believe the answer is:
dregs
This clue is a double definition.
'residue' is the first definition.
(I've seen this before)
'remains' is the second definition.
(I've seen this in another clue)
(Other definitions for dregs that I've seen before include "Leftover drink, sediment" , "Most worthless parts" , "Sediment at the bottom of a liquid" , "Sediment - rabble" , "Residue, lees" .)