Crossword Genius

Add "Inside there's a bird bone" (7)

Ross

I believe the answer is:

sternum

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sternum that I've seen before include "Human bone -- ten rums (anag)" , "front of breast" , "Breastbone" , "somewhere in chest" , "big bone" .)

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