Old-fashioned prior to finally introduce religious study (3)
I believe the answer is:
ere
'old-fashioned prior' is the definition.
'ere' can be an answer for 'prior' (I've seen this in another clue). I'm unsure of the 'old-fashioned' bit.
'finally introduce religious study' is the wordplay.
'ERE' is hidden in amongst the letters.
However, I am not sure how this is indicated.
'to' is the link.
Can you help me to learn more?
(Other definitions for ere that I've seen before include "Before (lit.)" , "Before, poetically" , "Before (in time)" , "Old prior" , "Before (literary)" .)