How to reproach the backward? (7)
I believe the answer is:
sternly
'how' is the definition.
Both the answer and definition are adverbs. Perhaps there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sternly that I've seen before include "Cruelly" , "In serious way" .)