The most common and most likely answer to this crossword clue is the 8 letter word PAUNCHES
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More clues leading to the result PAUNCHES
Buddy explains!

The straight part
We know that "signs of overindulgence" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case signs of overindulgence = paunches.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 PAUNCHES mean?
PAUNCHES noun- The first compartment of the stomach of a ruminant, the rumen.
- The belly of a human, especially a large, fat protruding one.
- A paunch mat.
- The thickened rim of a bell, struck by the clapper.