Uneducated rating on manoeuvres (8)
I believe the answer is:
ignorant
'uneducated' is the definition.
(similar in meaning)
'rating on manoeuvres' is the wordplay.
'manoeuvres' indicates an anagram.
'rating'+'on'='ratingon'
'ratingon' anagrammed gives 'IGNORANT'.
(Other definitions for ignorant that I've seen before include "ill-advised" , "not read" , "Lacking knowledge or skill" , "Empty-headed" , "Rude or knowing very little" .)