Crossword Genius

Fool Oscar but not Wilde? (4-3)

Ross

I believe the answer is:

half-wit

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'fool' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for half-wit that I've seen before include "Fool" , "Idiot" , "Hit flaw (anag.)" , "Nincompoop" , "One only 50% all there?" .)

I've seen this clue in The Sun.
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