Passion for burning gas (5)

I believe the answer is:

flame

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'passion' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for flame that I've seen before include "Hot" , "Send a rude message" , "Burner -- passion" , "Burning gas from fire" , "strong red" .)

I've seen this clue in The Mirror.

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