Crossword Genius

Precariousness of senior's pulse worrying (12)

Ross

I believe the answer is:

perilousness

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'precariousness' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'senior's pulse worrying' is the wordplay.
'worrying' indicates anagramming the letters.
'seniors'+'pulse'='seniorspulse'
'seniorspulse' anagrammed gives 'PERILOUSNESS'.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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