Speech about racket of admission to ministerial office (10)
I believe the answer is:
ordination
'admission to ministerial office' is the definition.
(the process of being ordained as a minister)
'speech about racket' is the wordplay.
'speech' becomes 'oration' (oration is a kind of speech).
'about' is an insertion indicator.
'racket' becomes 'din' (I've seen this before).
'oration' going around 'din' is 'ORDINATION'.
'of' is the link.
(Other definitions for ordination that I've seen before include "Conferral of holy orders" , "Solemn moment for a Christian" , "Investment" , "church ceremony" , "admission to ministry" .)