Rating on manoeuvres in the dark (8)
I believe the answer is:
ignorant
'in the dark' is the definition.
(I've seen this in another clue)
'rating on manoeuvres' is the wordplay.
'manoeuvres' is an anagram indicator.
'rating'+'on'='ratingon'
'ratingon' with letters rearranged gives 'IGNORANT'.
(Other definitions for ignorant that I've seen before include "Unknowing" , "Poorly-educated" , "ill-advised" , "Illiterate - unaware" , "Uneducated" .)