Bordeaux can't lose at rugby, eliminating Toulouse initially (6)
I believe the answer is:
claret
'bordeaux' is the definition.
(I've seen this before)
'can't lose at rugby eliminating toulouse initially' is the wordplay.
'initially' says to take the initial letters.
The initial letters of 'cant lose at rugby eliminating toulouse' is 'CLARET'.
(Other definitions for claret that I've seen before include "Purplish-red - blood" , "Red Bourdeaux wine" , "vessel might contain this?" , "Dark red Bordeaux wine" , "Dry red wine of Bordeaux" .)