Crossword Genius

Let there be light: ____ lux, Genesis 1.3 (4)

Ross

I believe the answer is:

fiat

(Other definitions for fiat that I've seen before include "Let it be done - it's a Latin order" , "Command" , "Order or decree - let it be done" , "Decree or official permission" , "car from Italy" .)

I've seen this clue in The Times.
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