How you can get a piece of cake (6)

I believe the answer is:

easily

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

I can't explain the rest of the clue.

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(Other definitions for easily that I've seen before include "with little effort" , "Without difficulty or effort" , "Effortlessly" , "Without much difficulty" , "With little difficulty" .)

I've seen this clue in the Evening Standard.

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