Cadet due to be taught (8)
I believe the answer is:
educated
'taught' is the definition.
(educating is a kind of teaching)
'cadet due to be' is the wordplay.
'to be' indicates an anagram.
'cadet'+'due'='cadetdue'
'cadetdue' with letters rearranged gives 'EDUCATED'.
(Other definitions for educated that I've seen before include "Schooled, enlightened" , "Civilised" , "Trained; learned" , "Having completed schooling, well informed" , "Erudite" .)