Politician reinvented Braille (7)
I believe the answer is:
liberal
'politician' is the definition.
(I've seen this before)
'reinvented braille' is the wordplay.
'reinvented' is an anagram indicator.
'braille' is an anagram of 'LIBERAL'.
(Other definitions for liberal that I've seen before include "Large-minded" , "Favouring individual freedoms" , "Ample; former politician" , "enlightened" , "Respectful of opinions different from one's own" .)