This daredevilry unnerves us, sad to reveal (15)

I believe the answer is:

adventurousness

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

'this daredevilry' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'unnerves us sad to reveal' is the wordplay.
'reveal' indicates an anagram.
'unnerves'+'us'+'sad'+'to'='unnervesussadto'
'unnervesussadto' with letters rearranged gives 'ADVENTUROUSNESS'.

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

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