Breastbones (6)
I believe the answer is:
sterna
'breastbones' is the definition.
('sternum' can be a synonym of 'breastbone')
This is the entire clue.
(Other definitions for sterna that I've seen before include "Breastbones" , "Formal backbones, Latin plural" , "Bones in front" .)
I've seen this clue in The Times, The Sunday Times and the King Feature Syndicate.
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