Acceptably; but, to one person, lazily (7)

I believe the answer is:

validly

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'acceptably' is the definition.
Both the answer and definition are adverbs. Maybe there's a link between them I don't understand?

'to one person lazily' is the wordplay.
'to one person' becomes 'val' (I can't justify this - if you can you should believe this answer much more).
'lazily' becomes 'idly' (synonyms).
'val'+'idly'='VALIDLY'

'but' acts as a link.

Can you help me to learn more?

(Other definitions for validly that I've seen before include "Legitimately" , "in lawful way" .)

I've seen this clue in the Evening Standard.

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