Beating bridge champion? (8)
I believe the answer is:
spanking
'beating' is the definition.
(spanking is a kind of beating)
'bridge champion?' is the wordplay.
'bridge' becomes 'span' ('span' can be a synonym of 'bridge').
'champion?' becomes 'king' (I've seen this in other clues).
'span'+'king'='SPANKING'
(Other definitions for spanking that I've seen before include "making one smart" , "Fantastic" , "Very good" , "Quick and energetic (1)" , "Physical punishment" .)