Dodgson's work reportedly disconcerted the Mirror? (7,3,7-5)

I believe the answer is:

through the looking-glass

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'dodgson's work reportedly disconcerted the mirror?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'reportedly disconcerted the mirror?' is the wordplay.
'reportedly disconcerted' becomes 'through' (I can't explain this - if you can you should believe this answer much more).
'mirror?' becomes 'looking glass' (looking glass is a kind of mirror).
'through'+'the'+'lookingglass'='THROUGH THE LOOKING-GLASS'

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