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One-time striker apparently losing weight without drug (9)

Ross

I believe the answer is:

lightning

I'm a little stuck... Click here to teach me more about this clue!

'drug' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for lightning that I've seen before include "Discharge of electricity in the atmosphere" , "Atmospheric discharge" , "Atmospheric electricity" , "Natural discharge of electricity" , "Flash in the sky" .)

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