They're played in no set order (5)

I believe the answer is:

notes

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'they're played' is the definition.
The definition suggests an adverb but the answer is not.

'no set order' is the wordplay.
'order' indicates anagramming the letters.
'set' anagrammed gives 'tes'.
'no'+'tes'='NOTES'

'in' is the link.

Can you help me to learn more?

(Other definitions for notes that I've seen before include "Memos; observes" , "Paper money" , "Memoranda" , "Marks on a stave" , "output from musicians" .)

I've seen this clue in The Globe and Mail.

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