Philosophy capturing detailed scene's climax (9)
I believe the answer is:
crescendo
'climax' is the definition.
(I've seen this before)
'philosophy capturing detailed scene's' is the wordplay.
'philosophy' becomes 'credo' (credo is a kind of philosophy).
'capturing' indicates putting letters inside.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'scene' with its final letter removed is 'scen'.
'credo' going around 'scen' is 'CRESCENDO'.
(Other definitions for crescendo that I've seen before include "Gradually increasing in volume" , "Increasing noise" , "Becoming louder in soccer den" , "In music, gradually becoming louder" , "Gradual loudening" .)