The most common and most likely answer to this crossword clue is the 8 letter word DWINDLED
I've seen this crossword clue in The Daily Telegraph
D
W
I
N
D
L
E
D
Buddy explains!

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 DWINDLED mean?
DWINDLED verb- To decrease, shrink, diminish, reduce in size or intensity.
- To fall away in quality; degenerate, sink.
- To lessen; to bring low.
- To break up or disperse.