Certainly not (2,4)

I think it could be either:

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2,3,4

2,4

no fear

'certainly not' is the definition.
(phrase used to express a denial or refusal)

This is the entire clue.

(Other definitions for no fear that I've seen before include "Never" , "Absolutely not" , "Definitely not (sl.)" , "Not on your life, certainly not" , "Very clear Five ac [REFUSAL]" .)

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