Crossword Genius

Learner set fire to fuel (7)

Ross

I believe the answer is:

lignite

'to fuel' is the definition.
(type of coal)

'learner set fire' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'set fire' becomes 'ignite' (to ignite something is to set it on fire).
'l'+'ignite'='LIGNITE'

(Other definitions for lignite that I've seen before include "Brown coal" , "Fuel" , "Soft brownish coal" , "rock" , "it'll burn" .)

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