Crossword Genius

To us, a record event (6)

Ross

I believe the answer is:

discus

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

'event' is the definition.
(athletics event)

'to us a record' is the wordplay.
I cannot quite understand how this works, but
'us' is present in the answer.
'record' could be 'disc' (eg a CD, compact disc) and 'disc' is found in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for discus that I've seen before include "Athlete's projectile" , "Object thrown by athletes" , "Sporting projectile" , "missile launched" , "Sports projectile" .)

I've seen this clue in the Evening Standard.
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