Bountiful braille that's dotty! (7)
I believe the answer is:
liberal
'bountiful' is the definition.
(I know that bountiful can be written as liberal)
'braille that's dotty' is the wordplay.
'that's dotty' indicates an anagram (dotty can mean mad).
'braille' anagrammed gives 'LIBERAL'.
(Other definitions for liberal that I've seen before include "Large-minded" , "party person?" , "Ample; former politician" , "Generous, like a British political party" , "Politically progressive" .)