"... a grin without a cat!" thinker (5)

I believe the answer is:

alice

(Other definitions for alice that I've seen before include "Girl in literary Wonderland" , "Looking-glass girl" , "Girl who famously explored Wonderland" , "Girl famous for entering Wonderland" , "A Town Like - - (novel/film)" .)

I've seen this clue in the LA Times.

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