Once more, embellish discourse after changing creed (10)
I believe the answer is:
redecorate
'once more embellish' is the definition.
('decorate' can be a synonym for 'embellish' so perhaps 'redecorate' is OK for 'once more embellish')
'discourse after changing creed' is the wordplay.
'discourse' becomes 'orate' (I've seen this in another clue).
'after' is a charade indicator (letters next to each other).
'changing' is an anagram indicator.
'creed' with letters rearranged gives 'redec'.
'orate' after 'redec' is 'REDECORATE'.
(Other definitions for redecorate that I've seen before include "Do some home improvement" , "Repaint" , "Possibly paint again" , "Change appearance of house, perhaps" , "Change colour of walls etc" .)