Crossword Genius

Piece of metal used for part of joint (5)

Ross

I believe the answer is:

talus

'part of joint' is the definition.
(the talus is an ankle bone)

'piece of metal used for' is the wordplay.
'piece of' indicates a hidden word.
'TALUS' is hidden within 'metal used for'.

(Other definitions for talus that I've seen before include "Foot's part" , "Yarns" , "Ankle bone" , "Ankle-bone" .)

I've seen this clue in The Guardian.
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