Accurate summary, note (7)
I believe the answer is:
precise
'accurate' is the definition.
(I know that accurate can be written as precise)
'summary note' is the wordplay.
'summary' becomes 'precis' (precis is a kind of summary).
'note' becomes 'e' (musical note).
'precis'+'e'='PRECISE'
(Other definitions for precise that I've seen before include "Specific" , "Highly accurate and sharply exact" , "Detailed, exact" , "'Exact, accurate (7)'" , "Exact like recipes" .)