Achilles is one wonderfully noted name (6)
I believe the answer is:
tendon
'achilles is one wonderfully' is the definition.
I can't judge whether this definition defines the answer.
'noted name' is the wordplay.
I cannot quite see how this works, but
an anagram of 'noted' is 'tendo' which is located in the answer.
'name' could be 'n' (common abbreviation e.g. on forms) and 'n' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tendon that I've seen before include "Strong band of tissue connecting muscles" , "personal connecting link" , "Fibrous band" , "In words" , "Muscle attacher" .)