Nerve broken? Certainly not! (5)

I believe the answer is:

never

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'not' is the definition.
(thesaurus)

'nerve broken? certainly' is the wordplay.
'nerve' anagrams to 'NEVER'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for never that I've seen before include "On no occasion" , "Not ever" , "' - - Say - - Again': Bond film" , "Not in a month of Sundays" , "I refuse" .)

I've seen this clue in the Evening Standard.

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