Educationally, a noted heavyweight (4)
I believe the answer is:
eton
'educationally a' is the definition.
I can't judge whether this defines the answer.
'noted heavyweight' is the wordplay.
'noted' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'heavyweight' becomes 'ton' (I've seen this before).
'e'+'ton'='ETON'
Can you help me to learn more?
(Other definitions for eton that I've seen before include "Note sent up to English public school" , "Public school (sounds like 20)" , "Easy to understand" , "Collar - crop - jacket - school" , "Public school founded in 1440" .)