Fraudster once, losing last of medals, ruined cycling event (4,2,6)

I believe the answer is:

tour de france

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'cycling event' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for tour de france that I've seen before include "Annual cycle race" , "Tuned for race (anag) - a cycle race" , "sporting event" , "Professional cycle road race" , "Major bike race" .)

I've seen this clue in The Times.

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