How to handle 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 they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for easily that I've seen before include "without doubt" , "Without much difficulty" , "Very probably" , "Simply" , "with little effort" .)

I've seen this clue in the Evening Standard.

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