Feel terrific — holy orders (not RC) providing a comfortable situation (3,4,2,5)
I believe the answer is:
the life of riley
'a comfortable situation' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'feel terrific holy orders not rc providing' is the wordplay.
I cannot really see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'providing' could be 'if' (eg 'providing it's sunny' means 'if it's sunny') and 'if' is found within the answer.
an anagram of 'feel' is 'elef' which is within the left over letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for the life of riley that I've seen before include "biography of an old mother?" , "La Dolce Vita" .)