The most common and most likely answer to this crossword clue is the 5 letter word ADUST
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The straight part
We know that "Charred" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case charred = adust.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 ADUST mean?
ADUST adjective- (usually postpositive, of a bodily humour) Abnormally dark or over-concentrated; associated with various states of discomfort or illness (specifically being too hot or dry).
- (by extension) Hot and dry; thirsty or parched.
- Burnt or having a scorched color.