New cadet due to be trained (8)
I believe the answer is:
educated
'be trained' is the definition.
(similar in meaning)
'new cadet due' is the wordplay.
'new' indicates anagramming the letters.
'cadet'+'due'='cadetdue'
'cadetdue' is an anagram of 'EDUCATED'.
'to' acts as a link.
(Other definitions for educated that I've seen before include "Clever" , "Schooled, trained" , "Maybe enlightened" , "Civilised" , "Cultivated, knowledgeable" .)