One caring about illiteracy (9)
I believe the answer is:
ignorance
'illiteracy' is the definition.
(I've seen this in another clue)
'one caring about' is the wordplay.
'about' indicates anagramming the letters.
'one'+'caring'='onecaring'
'onecaring' is an anagram of 'IGNORANCE'.
(Other definitions for ignorance that I've seen before include "State of unknowing" , "Bliss perhaps" , "'Where . . . . . . . . . is bliss, 'tis folly to be wise'" , "bliss, they say" , "Not knowing" .)