Crossword Genius

More than halfway through discussion on former plate for throwing (6)

Ross

I believe the answer is:

discus

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

'former plate for throwing' is the definition.
I can't judge whether this defines the answer.

'more than halfway through discussion on' is the wordplay.
'more than' becomes 'plus' (I've seen this in another clue).
'halfway' suggests halving the letters.
'through discussion' becomes 'disc' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'plus' with half the letters taken is 'us'.
'us' put after 'disc' is 'DISCUS'.

Can you help me to learn more?

(Other definitions for discus that I've seen before include "Circular projectile" , "Object thrown in athletic event" , "Item thrown in sport" , "It is thrown in athletic events" , "Olympic throwing event" .)

I've seen this clue in the Sydney Morning Herald.
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