"Oh ____! Look — what have we got to do to make you believe us?” (Till Death us do Part) (6,7)

I believe the answer is:

gordon bennett

(Other definitions for gordon bennett that I've seen before include "Expression of surprise or annoyance - not bond regent (anag)" , "My word" , "Exclamation - notorious US newsman (no relation to Alan or Arnold)" , "Blimey!" , "expression of exasperation" .)

I've seen this clue in The Times.

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