An event people can never quite talk about? (6)

I believe the answer is:

discus

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'an event' is the definition.
(athletics event)

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

(Other definitions for discus that I've seen before include "Athletics field event" , "Object thrown in field sports" , "Something thrown by athletes" , "Kind of plate thrown in sport" , "Sports projectile" .)

I've seen this clue in the Evening Standard.

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