Get to give a sermon, not quietly (5)
I believe the answer is:
reach
'get to' is the definition.
(synonyms)
'give a sermon not quietly' is the wordplay.
'give a sermon' becomes 'preach' (I've seen this before).
'not' indicates named letters should be taken away.
'quietly' becomes 'p' (p for piano and quiet).
'preach' with 'p' taken out is 'REACH'.
(Other definitions for reach that I've seen before include "Succeed in getting to" , "Come to - stretch of river" , "compass" , "Arrive at - stretch of river" , "Stretch of a river between two bends" .)