Climax of uncomfortable incident briefly disrupting faith (9)
I believe the answer is:
crescendo
'climax' is the definition.
(I've seen this before)
'incident briefly disrupting faith' is the wordplay.
'incident' becomes 'scene' (scene is a kind of incident).
'briefly' means to remove the last letter.
'disrupting' means one lot of letters goes inside another (inside letters 'disrupt' the flow of outside one).
'faith' becomes 'credo' (I've seen this before).
'scene' with its last letter removed is 'scen'.
'scen' inserted inside 'credo' is 'CRESCENDO'.
'of uncomfortable' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for crescendo that I've seen before include "climax" , "Building up of sound" , "with score building" , "rising from piano?" , "Gradual increase in volume" .)