Service good or grand here? A state! (8,4)

I believe the answer is:

midnight mass

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'service good' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'grand here? a state' is the wordplay.
'grand here?' becomes 'midnight' (I can't justify this - if you can you should give a lot more credence to this answer).
'a state' becomes 'mass' (abbreviation for Massachusetts).
'midnight'+'mass'='MIDNIGHT MASS'

'or' acts as a link.

Can you help me to learn more?

(Another definition for midnight mass that I've seen is " church service".)

I've seen this clue in The Times.

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