How you said "I've lost two stone"? (7)

I believe the answer is:

lightly

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'how' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

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

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(Other definitions for lightly that I've seen before include "Readily" , "With gentleness" , "easily" , "in delicate fashion" , "without good reason?" .)

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