They should know better (7)

I believe the answer is:

experts

I'm a little stuck... Click here to teach me more about this clue!

'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for experts that I've seen before include "Hotshots" , "Aces" , "dabs" , "Boffins" , "Buffs" .)

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

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