A legal right to the championship (5)

I believe the answer is:

title

I believe this is a double definition.

'a legal right' is the first definition.
(I know that title is a type of legal right)

'to the championship' is the second definition.
(a championship is a sporting title)

(Other definitions for title that I've seen before include "Form of address - name" , "Right to possession" , "Deed showing legal right to a property" , "Appellation signifying status or function" , "Lord, sir, doctor etc." .)

I've seen this clue in the Evening Standard.

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