They have precedence in the services of the services (6,7)
I believe the answer is:
church parades
'they have precedence in the services' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'the services' is the wordplay.
I cannot quite understand how this works, but
'the services' could be 'church' (church service is a kind of service) and 'church' is found in the answer.
The remaining letters 'parades' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Another definition for church parades that I've seen is " Occasions of compulsory religion".)