Crossword Genius

A bone can keep breaking! (7)

Ross

I believe the answer is:

kneecap

'a bone' is the definition.
(I know that kneecap is a type of bone)

'can keep breaking' is the wordplay.
'breaking' is an anagram indicator.
'can'+'keep'='cankeep'
'cankeep' with letters rearranged gives 'KNEECAP'.

(Other definitions for kneecap that I've seen before include "Joint protection" , "one going on bender?" , "Horribly punish" , "part of joint" , "The informal patella (7)" .)

I've seen this clue in the Best For Puzzles.
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