Muses, and anon spirit is transformed! (12)

I believe the answer is:

inspirations

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'muses' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

'anon spirit is transformed' is the wordplay.
'transformed' indicates anagramming the letters.
'anon'+'spirit'+'is'='anonspiritis'
'anonspiritis' anagrammed gives 'INSPIRATIONS'.

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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