Uneducated drunk ranting about nothing (8)
I believe the answer is:
ignorant
'uneducated' is the definition.
(I've seen this before)
'drunk ranting about nothing' is the wordplay.
'drunk' indicates an anagram.
'about' is an insertion indicator.
'nothing' becomes 'o' (looks like zero - 0).
'ranting' anagrammed gives 'ignrant'.
'ignrant' enclosing 'o' is 'IGNORANT'.
(Other definitions for ignorant that I've seen before include "Knowing nothing" , "blissful?" , "Lacking knowledge or awareness" , "Devoid of knowledge" , "Uncouth or uninformed" .)