"Shiny Happy People" group (3)

I believe the answer is:

rem

'shiny happy people group' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rem that I've seen before include "radiation unit" , "Sleep stage when dreaming occurs" , "Phase in sleep" .)

I've seen this clue in the Thinks.com.

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