The most common and most likely answer to this crossword clue is the 8 letter word SINGEING
I've seen this crossword clue in The Guardian
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More clues leading to the result SINGEING
Buddy explains!

The straight part
We know that "Charring" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case charring = singeing.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 SINGEING mean?
SINGEING verb- To burn slightly.
- To remove the nap of (cloth), by passing it rapidly over a red-hot bar, or over a flame, preliminary to dyeing it.
- To remove the hair or down from (a plucked chicken, etc.) by passing it over a flame.
- The act or process of slightly burning.
- A singe; a slight burn.