Crossword Genius

The moment fool gets Irishwoman bit of shamrock (2,4,2)

Ross

I believe the answer is:

as soon as

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'the moment' is the definition.
I know nothing about this answer so I can't judge whether this works.

'fool gets irishwoman bit of shamrock' is the wordplay.
'fool' becomes 'ass' (both can mean a stupid person).
'gets irishwoman' becomes 'oona' (I can't justify this - if you can you should give a lot more credence to this answer).
'bit of' suggests taking the first letters.
The initial letter of 'shamrock' is 's'.
'ass'+'oona'+'s'='AS SOON AS'

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I've seen this clue in The Independent.
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