Yes countess.

Ringer bet; losing? No! (6)

 

Convex....

No, not convex.

 

Ringer bet; losing? No! (6)

 

_ a _ _ _ _

Capper....

No, capper isn’t it.

 

Ringer bet; losing? No! (6)

 

_ a _ n _ _

 

 

Actually… it will make more sense if I adjust this to:

 

Ringer bet; winning? No! (6)

 

_ a _ n _ _

Ringer bet; winning? No! (6)

 

_ a _ n e _

 

 

There’s a charade, an addition indicator, an abbreviation…

The whole definition is musical. It’s who did what.

 

 

Ringer bet; winning? No! (6)

 

_ a _ n e _

 

 

There’s a charade (bet), an addition indicator, an abbreviation…

Wagner……????