Dinar Don changed for would-be priest? (8)
I believe the answer is:
ordinand
'would-be priest?' is the definition.
'dinar don changed' is the wordplay.
'changed' indicates an anagram.
'dinar'+'don'='dinardon'
'dinardon' with letters rearranged gives 'ORDINAND'.
'for' is the link.
(Other definitions for ordinand that I've seen before include "Rain in odd way for candidate for priesthood" , "Potential minister" , "Trainee for priesthood" , "Trainee cleric" , "one awaiting licence" .)