Ignorant, but not tight, do we hear? (8)
I believe the answer is:
untaught
'ignorant' is the definition.
(thesaurus)
'not tight do we hear?' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'tight' becomes 'taut' (synonyms).
'do we hear?' shows a homophone (sound like).
'taut' sounds like 'taught'.
'un'+'taught'='UNTAUGHT'
'but' acts as a link.
(Other definitions for untaught that I've seen before include "Not educated" , "Without instruction" , "Not acquired by education" , "not learned" , "excluded from lessons" .)