Favouring bridge player in suitable sacrifice (7)
I believe the answer is:
forfeit
'sacrifice' is the definition.
(thesaurus)
'favouring bridge player in suitable' is the wordplay.
'favouring' becomes 'for' (I've seen this before).
'bridge player' becomes 'e'.
'in' is an insertion indicator.
'suitable' becomes 'fit' ('fit' can be similar in meaning to 'suitable').
'e' placed inside 'fit' is 'feit'.
'for'+'feit'='FORFEIT'
(Other definitions for forfeit that I've seen before include "Effort I made to pay penalty" , "Penalty for wrongdoing" , "Sacrifice" , "Give up or lose the right to something" , "Something given up as a penalty" .)