"In Oppley they're smart, and in Stouch they're ____, but Midwich folk are just plain barmy' (John Wyndham) (6)

I believe the answer is:

smarmy

(Other definitions for smarmy that I've seen before include "Conceal oneself" , "Oleaginous" , "Slick" , "Fawning" , "Smooth" .)

I've seen this clue in The Times.

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