Many duos arranged entertaining operas in Lenten time (9,6)

I believe the answer is:

mothering sunday

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'lenten time' is the definition.
The definition suggests a singular noun which matches the answer.

'many duos arranged entertaining operas' is the wordplay.
'arranged' is an anagram indicator.
'entertaining' is an insertion indicator.
'operas' becomes 'The Ring' (The Ring, cycle of operas by Richard Wagner).
'many'+'duos'='manyduos'
'manyduos' anagrammed gives 'mosunday'.
'mosunday' placed around 'thering' is 'MOTHERING SUNDAY'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for mothering sunday that I've seen before include "part of Lent" , "occasion for relation?" .)

I've seen this clue in The Telegraph.

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