European knocked over loses a necklace (4)

I believe the answer is:

torc

'necklace' is the definition.
(medieval neck ornament)

I can't explain the remainder of the clue.

(Other definitions for torc that I've seen before include "Metal neck ornament of ancient Britons" , "One gets into a twist" , "Metal armband worn by Ancient Britons" , "ancient necklace" , "Celtic metal neck-ring" .)

I've seen this clue in The Guardian.

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