Hosanna! Your motet noted in worthy mnemonic? (4)

I believe the answer is:

hymn

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'hosanna' is the definition.
(thesaurus)

'in worthy mnemonic?' is the wordplay.
'in' says the answer is hidden in the clue.
'HYMN' can be found hidden inside 'worthy mnemonic'.

'your motet noted' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for hymn that I've seen before include "Orison" , "Anthem" , "religious works" , "Song of worship" , "Special song" .)

I've seen this clue in The Telegraph.

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