Crossword Genius

In addition, bird has a breastbone (7)

Ross

I believe the answer is:

sternum

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'a breastbone' is the definition.
(synonyms)

'in addition bird' is the wordplay.
'in' means one lot of letters goes inside another.
'addition' becomes 'sum' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bird' becomes 'tern' (tern is a kind of bird).
'sum' placed around 'tern' is 'STERNUM'.

'has' acts as a link.

Can you help me to learn more?

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

I've seen this clue in The Guardian.
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