Fury after prayer, mean (7)
I believe the answer is:
average
'mean' is the definition.
(I know that mean can be written as average)
'fury after prayer' is the wordplay.
'fury' becomes 'rage' (synonyms).
'after' means one lot of letters go next to another.
'prayer' becomes 'ave' (I've seen this in another clue).
'rage' put after 'ave' is 'AVERAGE'.
(Other definitions for average that I've seen before include "Arithmetic mean" , "It may be mean" , "Normal in arithmetic way" , "Mean - medium" , "par" .)