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Drug aiming to eliminate the onset of gout (7)

Ross

I believe the answer is:

aspirin

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'drug' is the definition.
(aspirin is a kind of drug)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for aspirin that I've seen before include "Commonly used pain-killer", "headache cure", "Anti-inflammatory tablet", "Headache killer?", "Analgesic compound".)

I've seen this clue in The Telegraph.
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