The most common and most likely answer to this crossword clue is the 8 letter word REMNANTS
I've seen this crossword clue in Independent
R
E
M
N
A
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S
Buddy explains!
The straight part
We know that "the bits left over" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the bits left over = remnants.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 REMNANTS mean?
REMNANTS noun- The small portion remaining of a larger thing or group.
- The remaining fabric at the end of the bolt.
- An unsold end of piece goods, as cloth, ribbons, carpets, etc.