Spread out since crook shows initial extravagance (9)

I believe the answer is:

fanciness

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'extravagance' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?

'spread out since crook shows initial' is the wordplay.
'spread out' becomes 'fan' (I've seen this in another clue).
'crook' indicates an anagram (a crooked version of the letters).
'initial' says to take the initial letters.
The first letter of 'shows' is 's'.
'since' with letters rearranged gives 'cines'.
'fan'+'cines'+'s'='FANCINESS'

Can you help me to learn more?

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

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