Teaches US cadet manoeuvres around end of June (8)
I believe the answer is:
educates
'teaches' is the definition.
(educating is a kind of teaching)
'us cadet manoeuvres around end of june' is the wordplay.
'manoeuvres' indicates an anagram.
'around' is an insertion indicator.
'end of' indicates one should take the final letters.
The final letter of 'june' is 'e'.
'us'+'cadet'='uscadet'
'uscadet' anagrammed gives 'educats'.
'educats' placed around 'e' is 'EDUCATES'.
(Other definitions for educates that I've seen before include "Trains the mind and abilities" , "Instructs, teaches" , "Trains, teaches" .)