Sock lady and dry one converted to and fro (6,3,6)

I believe the answer is:

hither and yonder

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'and fro' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'sock lady and dry one converted' is the wordplay.
'sock lady' becomes 'hither' (I can't explain this - if you can you should believe this answer much more).
'converted' indicates an anagram.
'dry'+'one'='dryone'
'dryone' with letters rearranged gives 'yonder'.
'hither'+'and'+'yonder'='HITHER AND YONDER'

'to' is the link.

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I've seen this clue in the Sydney Morning Herald.

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