Charm of spoken prayers (6)
I believe the answer is:
please
'charm' is the definition.
'spoken prayers' is the wordplay.
'spoken' shows a homophone (sound like).
'prayers' becomes 'pleas' (plea is a kind of prayer).
'pleas' is a homophone of 'PLEASE'.
'of' acts as a link.
(Other definitions for please that I've seen before include "Beatles song (request to oblige?)" , "Be good enough to" , "If you'd be so kind?" , "'Delight, gratify (6)'" , "It's said to help" .)