Musical performances from people who speak publicly about Nixon regularly (9)
I believe the answer is:
oratorios
'musical performances' is the definition.
(type of musical composition)
'people who speak publicly about nixon regularly' is the wordplay.
'people who speak publicly' becomes 'orators' (an orator is a public speaker).
'about' indicates putting letters inside.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'nixon' are 'io'.
'orators' enclosing 'io' is 'ORATORIOS'.
'from' is the link.
(Other definitions for oratorios that I've seen before include "Musical compositions based on religious texts" , "orchestral and choral pieces" .)