Notes about one performance (3)
I believe the answer is:
gig
'performance' is the definition.
(I've seen this before)
'notes about one' is the wordplay.
'notes' becomes 'gg' (**).
'about' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'gg' going around 'i' is 'GIG'.
(Other definitions for gig that I've seen before include "A palindromic one-night performance" , "A one-night musical performance" , "One-night stand" , "A booking for musicians" , "Live performance by musicians" .)