Old meeting of note (5)
I believe the answer is:
'old' is the definition.
(I've seen this in another clue)
'meeting of note' is the wordplay.
I cannot really see how this works, but
'meeting' could be 'date' (date is a kind of meeting) and 'date' is present in the answer.
'note' could be 'd' (musical note) and 'd' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dated that I've seen before include "not without romantic engagements" , "Revealed the age of" , "out of the ark" , "Passe" , "No longer fashionable or current" .)