Knowledgeable cadet due to be moved (8)
I believe the answer is:
educated
'knowledgeable' is the definition.
(similar in meaning)
'cadet due to be moved' is the wordplay.
'to be moved' is an anagram indicator.
'cadet'+'due'='cadetdue'
'cadetdue' is an anagram of 'EDUCATED'.
(Other definitions for educated that I've seen before include "Instructed, taught" , "Clever" , "Schooled, trained" , "Civilised" , "Learned - cultivated" .)