Crossword Genius

Bone in back? Er... ! (7)

Ross

I believe the answer is:

sternum

'bone' is the definition.
(sternum is a kind of bone)

'back? er' is the wordplay.
'back?' becomes 'stern' (stern is a kind of back).
'er' becomes 'um'.
'stern'+'um'='STERNUM'

'in' is the link.

(Other definitions for sternum that I've seen before include "Munster (anag.)" , "Breastbone" , "Chest bone" , "big bone" , "front of breast" .)

I've seen this clue in The Telegraph.
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