Commemorated by the famous (10)
I believe the answer is:
celebrated
'famous' is the definition.
(I know that famous can be written as celebrated)
'commemorated by' is the wordplay.
I cannot really understand how this works, but
'by' could be 'at' and 'at' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Other definitions for celebrated that I've seen before include "Did something enjoyable (to mark an event)" , "Publicly honoured" , "Observed (festival); famous" , "Notable" , "Eminent" .)