Crossword Genius

Following explosion initially in light on ceiling, not flammable or inflammable (10)

Ross

I believe the answer is:

flameproof

I'm a little stuck... Click here to teach me more about this clue!

'following explosion' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'initially in light on ceiling not flammable or inflammable' is the wordplay.
I cannot really see how this works, but
'light' could be 'flame' (I've seen this before) and 'flame' is found in the answer.
'ceiling' could be 'roof' (I've seen this in another clue) and 'roof' is found within the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for flameproof that I've seen before include "Resistant to burning" , "Non-flammable" , "Resistant to fire" .)

I've seen this clue in The Guardian.
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