The worst of the worst? (5)
I believe the answer is:
dregs
'the worst of the worst?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dregs that I've seen before include "Wine sediment" , "Residue of drink" , "Fluid remnants" , "Remnant of drink" , "Wine or coffee residue" .)