Flame Proof Crossword Clue

One confident answer with explanation of the wordplay

ASH
Possible
A
S
H

The clue "Flame proof?" uses a question mark to signal wordplay. "Proof" in a printing/publishing sense means evidence or result. The "proof" (result/evidence) of a flame is ASH — what remains after something burns. The question mark signals this lateral thinking.

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Other possible answers
SCARA scar could be considered 'proof' of a burn/flame, though less direct.
BURNA burn mark is proof that a flame existed, but this feels too literal.
CHARCharring is direct evidence (proof) of flame contact.

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