Crossword Genius

Legal proof that you’re the champion? (5,4)

Ross

I believe the answer is:

title deed

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'legal proof' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for title deed that I've seen before include "Document proving ownership" , "Having proof of ownership" , "Document giving legal right of ownership" , "proper document" , "Deleted it (anag.)" .)

I've seen this clue in the Evening Standard.
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