Crossword Genius

Crazy about noisy estate outside fantasy realm (5-6-4)

Ross

I believe the answer is:

cloud-cuckoo-land

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

'fantasy realm' is the definition.
(I've seen this before)

'crazy about noisy estate outside' is the wordplay.
'crazy' becomes 'cuckoo' (I've seen this before).
'about noisy' becomes 'cloud' (I can't explain this - if you can you should give a lot more credence to this answer).
'estate' becomes 'land' (synonyms).
'outside' indicates putting letters inside.
'cloud'+'land'='cloudland'
'cuckoo' going into 'cloudland' is 'CLOUD-CUCKOO-LAND'.

Can you help me to learn more?

I've seen this clue in The Independent.
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