Official swore no rock climbing - after fragments fall off (7)

I believe the answer is:

coroner

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

'official' is the definition.
(I know that coroner is a type of official)

'swore no rock climbing after fragments fall off' is the wordplay.
'CORONER' is hidden back-to-front in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for coroner that I've seen before include "Investigator" , "Public official who conducts inquests" , "He presides over an inquest (7)" , "Inquest holder" , "One presides at inquests" .)

I've seen this clue in The Independent.

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