Crossword Genius

I don't know what will get me through security (4)

Ross

I believe the answer is:

pass

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'i don't know' is the definition.
(e.g. response in a quiz)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pass that I've seen before include "acceptable exam result" , "Exceed; mountain route" , "Exam success" , "Overtake; permit" , "sticky situation if one is pretty" .)

I've seen this clue in The Telegraph.
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