Proprietary – that’s evident (6)
I believe the answer is:
patent
This clue might be a double definition.
'proprietary' is the first definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'evident' is the second definition.
('patent' can be a synonym of 'evident')
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for patent that I've seen before include "For all to see" , "Manifest" , "Transparent" , "Obvious - property right to invention" , "Document granting an inventor sole rights to an invention" .)