Brittle quality of princess is fitting (10)

I believe the answer is:

crispiness

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

'brittle quality' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'princess is fitting' is the wordplay.
'fitting' indicates an anagram (letters fit or arranged differently).
'princess'+'is'='princessis'
'princessis' with letters rearranged gives 'CRISPINESS'.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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