Emma's squire organised a service (7,4)

I believe the answer is:

requiem mass

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

'emma's squire organised' is the wordplay.
'organised' is an anagram indicator.
'emmas'+'squire'='emmassquire'
'emmassquire' anagrammed gives 'REQUIEM MASS'.

Can you help me to learn more?

(Another definition for requiem mass that I've seen is " religious work".)

I've seen this clue in The Irish Independent.

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