Crossword Genius

Rages if source of heat is changed (3,4)

Ross

I believe the answer is:

gas fire

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'heat is changed' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'rages if source of' is the wordplay.
'source of' indicates anagramming the letters.
'rages'+'if'='ragesif'
'ragesif' anagrammed gives 'GAS FIRE'.

Can you help me to learn more?

(Other definitions for gas fire that I've seen before include "source of heat" , "Domestic form of heater" , "Glower" .)

I've seen this clue in The Globe and Mail and The Irish News.
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