Crossword Genius

Proprietary - that's very clear (6)

Ross

I believe the answer is:

patent

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'clear' is the definition.
(synonyms)

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(Other definitions for patent that I've seen before include "The invention protection is obvious" , "easily accessible" , "The right to an invention is clear" , "Obvious, unconcealed" , "Registration of ownership of invention" .)

I've seen this clue in the Evening Standard.
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