Crossword Genius

Getting really pally with is stupid (5)

Ross

I believe the answer is:

thick

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'is stupid' is the definition.
(similar in meaning)

I don't understand how the rest of the clue works.

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(Other definitions for thick that I've seen before include "Concentrated" , "Stupid (as two short planks?)" , "Friendly" , "Slow" , "Broad; dense" .)

I've seen this clue in the Evening Standard.
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