The most common and most likely answer to this crossword clue is the 8 letter word RESIDUUM
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "What's left" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what's left = residuum.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 RESIDUUM mean?
RESIDUUM noun- The residue, remainder or rest of something
- The solid material remaining after the liquid in which it was dissolved has been evaporated; a residue.
- A binary function from [0,1] × [0,1] to [0,1] which is defined in terms of the t-norm as follows: x \rightarrow y = \sup \{ z
- z * x \leqslant y\}, where * denotes the t-norm function and \sup denotes the supremum.
- The residue of an estate