Deliver notes during ceremony (6)
I believe the answer is:
recite
'deliver' is the definition.
(I've seen this before)
'notes during ceremony' is the wordplay.
'notes' becomes 'ec' ().
'during' is an insertion indicator.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'ec' placed within 'rite' is 'RECITE'.
(Other definitions for recite that I've seen before include "deliver lines that have been recalled" , "Ire etc (anag)" , "Repeat aloud form memory( 6)" , "Repeat aloud from memory as for audience" , "Read out" .)