Crossword Genius

Bagging 500 in opening spell of bowling is excessive (8)

Ross

I believe the answer is:

overdone

'is excessive' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for overdone that I've seen before include "Exaggerated; cooked too much" , "Cooked too much or carried too far" , "Hammed up" , "Exaggerated - far from rare" , "Exaggerated; burnt (meat)" .)

I've seen this clue in The Guardian.
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