Crossword Genius

What owl says to nursemaid at the party? (9)

Ross

I believe the answer is:

hootnanny

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

'what owl says' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'nursemaid at the party?' is the wordplay.
'nursemaid' becomes 'nanny' (synonyms).
'at' says to put letters next to each other (I've seen this in other clues).
'the party?' becomes 'hoot' (I can't justify this - if you can you should believe this answer much more).
'nanny' put after 'hoot' is 'HOOTNANNY'.

'to' is the link.

Can you help me to learn more?

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