Striking quality that can be graded again? (10)
I believe the answer is:
remarkable
'striking' is the definition.
(I've seen this before)
'quality that can be graded again?' is the wordplay.
I cannot really see how this works, but
'quality' could be 'mark' (mark is a kind of quality) and 'mark' is present in the answer.
'can' could be 'able' (I've seen this in other clues) and 'able' is located in the answer.
'again?' could be 're' (prefix meaning 'again') and 're' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for remarkable that I've seen before include "Striking" , "Noteworthy" , "unusual" , "A wrongly-graded exam paper" , "Extraordinary" .)