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Out of such groups one is miserable (5)

Ross

I believe the answer is:

sorts

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'out of such groups' is the definition.
The answer and definition can be both related to thinking as well as being plural nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for sorts that I've seen before include "Out of this is unhappy" , "Orders" , "Types" , "Systematically arranges" , "classes" .)

I've seen this clue in The Globe and Mail.
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