A ceremony rendered by speaker correctly (6)
I believe the answer is:
aright
'correctly' is the definition.
('aright' can be a synonym of 'correctly')
'a ceremony rendered by speaker' is the wordplay.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'rendered by speaker' shows a homophone (sound like).
'rite' sounds like 'right'.
'a'+'right'='ARIGHT'
(Other definitions for aright that I've seen before include "Hat rig (anag.)" , "Correctly" , "Properly" .)