Crossword Genius

Coal's left out to light (6)

Ross

I believe the answer is:

ignite

'light' is the definition.
(thesaurus)

'coal's left out' is the wordplay.
'coal' becomes 'lignite' (lignite is a kind of coal).
'left' becomes 'l' (common abbreviation).
'out' suggests deleting specific letters.
'lignite' with 'l' removed is 'IGNITE'.

'to' acts as a link.

(Other definitions for ignite that I've seen before include "Kindle Fire" , "Touch off; inflame" , "Cause to start burning" , "Put a match to" , "Torch" .)

I've seen this clue in The Telegraph.
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