Ring, one given good knock by extremely heavy or refined hand (11)
I believe the answer is:
calligraphy
'refined hand' is the definition.
(refined handwriting)
'ring one given good knock by extremely heavy' is the wordplay.
I cannot really understand how this works, but
'ring' could be 'call' (synonyms) and 'call' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'good' could be 'g' (abbreviation) and 'g' is found within the answer.
'knock' could be 'rap' (synonyms) and 'rap' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'or' is the link.
(Other definitions for calligraphy that I've seen before include "Beautiful handwriting" , "Decorative handwriting as an art" , "Beautiful script" , "Fine penmanship" .)