Says something about grades given by examiners (7)
I believe the answer is:
remarks
'says' is the definition.
(remarking is a kind of saying)
'something about grades given by examiners' is the wordplay.
I cannot really see how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is located in the answer.
'grades' could be 'marks' ('mark' can be a synonym of 'grade') and 'marks' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for remarks that I've seen before include "Comments, observations" , "See 14" .)