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Without a doubt, egghead's trick with bot upset them (2,2,4)

Ross

I believe the answer is:

to be sure

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'without a doubt' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for to be sure that I've seen before include "Undoubtedly" , "I admit" , "Without doubt" , "Of course, certainly" , "Admittedly" .)

I've seen this clue in The Irish Times.
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