Crossword Genius

Joint with a cap (4)

Ross

I believe the answer is:

knee

'joint with a cap' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for knee that I've seen before include "Joint protected by the patella" , "Wounded in Indian Wars action" , "joint input" , "Capped joint?" , "Thigh/shin connector" .)

I've seen this clue in the USA Today, The Wall Street Journal and the Universal.
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