Win in a bridge tournament (3)
I believe the answer is:
get
'win' is the definition.
(thesaurus)
'in a bridge tournament' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GET' is hidden within 'a bridge tournament'.
(Other definitions for get that I've seen before include "Understand" , "Receive; obtain" , "Procure from vegetables" , "Fetch or obtain" , "Procure or secure" .)