They dont think much of others (7)

I believe the answer is:

egoists

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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 cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for egoists that I've seen is " Selfish, vain types".)

I've seen this clue in The Irish News.

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