More nieces involved in the formal observances (10)

I believe the answer is:

ceremonies

I'm a little stuck... Click here to teach me more about this clue!

'formal observances' is the definition.
'ceremonies' can be an answer for 'observances' ('ceremony' can be a synonym of 'observance'). I am not certain of the 'formal' bit.

'more nieces involved in' is the wordplay.
'involved in' is an anagram indicator (involved can mean complex or confusing).
'more'+'nieces'='morenieces'
'morenieces' with letters rearranged gives 'CEREMONIES'.

'the' acts as a link.

Can you help me to learn more?

(Another definition for ceremonies that I've seen is " Religious rituals".)

I've seen this clue in the Sydney Morning Herald.

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