The most common and most likely answer to this crossword clue is the 5 letter word DREGS
I've seen this crossword clue in The Daily Telegraph
D
R
E
G
S
More clues leading to the result DREGS
- Busy collecting something on plate that drinker’s left?
- Doctor, for example, initially studying remains
- Red Reg slurps contains sediment
- Doctor, for example, beginning to swallow sediment
- The most worthless date on car numbers
- What’s at the bottom of the bottle, for example, doctor’s swallowed
- Pharmacy business stocks ecstasy for you, on telephone deposit
- Car sold in 1966 bearing riff-raff
- Refuse cars from ’66 and ’86?
- Waste grounds
Buddy explains!

The straight part
We know that "Waste grounds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case waste grounds = dregs.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DREGS mean?
DREGS noun- (collectively) The sediment settled at the bottom of a liquid; the lees in a container of unfiltered wine.
- (the dregs) The worst and lowest part of something.