Demure woman's hosting function for divas (5,6)

I believe the answer is:

prima donnas

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'for divas' is the definition.
('prima donna' can be a synonym of 'diva')

'demure woman's hosting function' is the wordplay.
'demure' becomes 'prim' (I've seen this before).
'woman's' becomes 'Adas'.
'hosting' is an insertion indicator.
'function' becomes 'onn' (I can't explain this - if you can you should give a lot more credence to this answer).
'adas' going around 'onn' is 'adonnas'.
'prim'+'adonnas'='PRIMA DONNAS'

Can you help me to learn more?

(Other definitions for prima donnas that I've seen before include "divas" , "opera stars" .)

I've seen this clue in The Daily Mail.

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