Demands to see old religious text (6)
I believe the answer is:
exacts
'demands' is the definition.
(exacting is a kind of demanding)
'old religious text' is the wordplay.
'old' becomes 'ex'.
'religious text' becomes 'acts' (Acts is an example).
'ex'+'acts'='EXACTS'
'to see' acts as a link.
(Other definitions for exacts that I've seen before include "Compels to furnish" , "making demands" , "Extorts" , "Insists on and obtains, say payment - sounds precise" , "Compels payment of" .)