Talk over judge (5)
I believe the answer is:
'talk' is the definition.
(to orate is to give a speech)
'over judge' is the wordplay.
'over' becomes 'o' (cricket abbreviation).
'judge' becomes 'rate' (rating is a kind of judging).
(Other definitions for orate that I've seen before include "Spout" , "Make a flowery speech" , "make speeches" , "Lecture" , "Speak pompously and at length" .)