They tend not to know people well (6)

I believe the answer is:

nurses

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for nurses that I've seen before include "Takes care of the sick" , "preserves" , "Matrons, midwives etc." , "Hospital workers" , "They tend the sick" .)

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

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