How quickly it was conveyed that both were right? (2,3,5)

I believe the answer is:

in two ticks

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'how' is the definition.
Both the answer and definition are adverbs.
Perhaps you can see a link between them that I don't see?

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

Can you help me to learn more?

(Other definitions for in two ticks that I've seen before include "Fast" , "Soon" .)

I've seen this clue in the Evening Standard.

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