Crossword Genius

The act of setting on fire (8)

Ross

I believe the answer is:

ignition

(Other definitions for ignition that I've seen before include "Kindling process" , "Act of catching fire" , "Internal-combustion engine's firing system" , "Car engine starter" , "Mechanism to start car engine by sparking fuel" .)

I've seen this clue in the Sydney Morning Herald.
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