21 down
…
Lewis’s
character
–
conclusively
yet
obliquely
(6)
… Lewis’s character – conclusively yet obliquely (6)
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The definition is at the end of the clue.
How the clue works
Start with Lewis's character — that's ASLAN, the lion from Narnia. Then tack on the "conclusive" letter of "yet", meaning its last letter, T, onto the end. Put them together and you get the definition obliquely, meaning at a slant.