Crossword Genius

Evidence of storm easing when energy is lost (9)

Ross

I believe the answer is:

lightning

'evidence of storm' is the definition.
(lightning occurs in a storm)

I don't understand the remainder of the clue.

(Other definitions for lightning that I've seen before include "Flash in the sky" , "Precaution against electrical storms" , "extremely fast?" , "Discharge of electricity in the atmosphere" , "Atmospheric electricity" .)

I've seen this clue in The Independent.
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