Crossword Genius

No rating could be so unenlightened! (8)

Ross

I believe the answer is:

ignorant

'unenlightened' is the definition.
('ignorant' can be a synonym of 'unenlightened')

'no rating could be' is the wordplay.
'could be' is an anagram indicator.
'no'+'rating'='norating'
'norating' anagrammed gives 'IGNORANT'.

'so' is the link.

(Other definitions for ignorant that I've seen before include "Lacking knowledge or awareness" , "Ill-educated" , "Lacking knowledge or lacking manners" , "Crass" , "Unaware, uninformed" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app