Crossword Genius

E.g. Lewis given wrong information, obscuring case (4)

Ross

I believe the answer is:

isle

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'wrong information obscuring case' is the definition.
I can't judge whether this defines the answer.

'e g lewis given' is the wordplay.
'g lewis' becomes 'isl' (I can't justify this - if you can you should believe this answer much more).
'given' says to put letters next to each other.
'e' after 'isl' is 'ISLE'.

Can you help me to learn more?

(Other definitions for isle that I've seen before include "eg Man, Ely" , "Lilliput, say" , "Capri for one" , "Piece of land in water" , "I shall hear" .)

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