Passion behind prayer, nothing special (7)
I believe the answer is:
average
'nothing special' is the definition.
(I've seen this before)
'passion behind prayer' is the wordplay.
'passion' becomes 'rage' ('rage' can be a synonym of 'passion').
'behind' means one lot of letters go next to another.
'prayer' becomes 'ave' (I've seen this in other clues).
'rage' after 'ave' is 'AVERAGE'.
(Other definitions for average that I've seen before include "Arithmetical mean" , "Medial" , "par" , "Run of the mill" , "Of no exceptional quality or ability" .)