A joint stake (6)

I believe the answer is:

skewer

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This might be a double definition.

'a joint' is the first definition.
(thesaurus)

'stake' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for skewer that I've seen before include "Pin for cooking meats" , "Transfix" , "Long metal pin" , "Is one stuck into a joint" , "More oblique" .)

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

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