Old-fashioned renegade's exclamation (4)

I believe the answer is:

egad

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'exclamation' is the definition.
(I have seen 'Archaic exclamation ' mean 'egad' so perhaps 'exclamation' could also mean 'egad')

'old-fashioned renegade's' is the wordplay.
'EGAD' is hidden within the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for egad that I've seen before include "traditional oath" , "Mild oath (archaic)" , "Oath sworn" , "Mild oath - aged (anag)" , "Old oath" .)

I've seen this clue in the Evening Standard.

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