Bone up over in opera house (7)

I believe the answer is:

scapula

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

'up over in opera house' is the wordplay.
'over' indicates anagramming the letters.
'in' indicates putting letters inside.
'opera house' becomes 'scala' (I can't explain this - if you can you should believe this answer much more).
'up' anagrammed gives 'pu'.
'pu' put within 'scala' is 'SCAPULA'.

Can you help me to learn more?

(Other definitions for scapula that I've seen before include "Shoulder-blade" , "Shoulder blade" , "Shoulder-bone" , "Flat, triangular human bone - cap Saul (anag)" .)

I've seen this clue in The Guardian.

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