Crossword Genius

They keep taking what they need (7)

Ross

I believe the answer is:

addicts

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'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for addicts that I've seen before include "Junkies" , "Habitual drug users" , "People with compulsive ailments as for drugs" , "People who are hooked" .)

I've seen this clue in the Evening Standard.
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