The most common and most likely answer to this crossword clue is the 12 letter word DETERIORATED
I've seen this crossword clue in The Times
D
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Buddy explains!
The straight part
We know that "got worse" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case got worse = deteriorated.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 DETERIORATED mean?
DETERIORATED verb- To make worse; to make inferior in quality or value; to impair.
- To grow worse; to be impaired in quality; to degenerate.