Crossword Genius

How to keep a secret? Not at all! (4,7,2)

Ross

I believe the answer is:

dont mention it

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'not at all' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for dont mention it that I've seen before include "It was nothing" , "That's all right" , "Refrain from talking about the situation" , "Let's not discuss computers" , "keep it secret" .)

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