Crossword Genius

What domestic arsonist may do? One gives a warning (10)

Ross

I believe the answer is:

lighthouse

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'one gives a warning' is the definition.

I cannot understand how the rest of the clue works.

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(Other definitions for lighthouse that I've seen before include "it sends a warning" , "It was a wonder" , "Beamer" , "Warning feature for shipping" , "tower" .)

I've seen this clue in The Telegraph.
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