Crossword Genius

Mistake-prone music building in dramatic setting (10,4)

Ross

I believe the answer is:

proscenium arch

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

'dramatic setting' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'mistake-prone music building' is the wordplay.
'mistake' is an anagram indicator.
'building' becomes 'arch'.
'prone'+'music'='pronemusic'
'pronemusic' with letters rearranged gives 'proscenium'.
'proscenium'+'arch'='PROSCENIUM ARCH'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for proscenium arch that I've seen before include "theatre part" , "Front part of a stage" .)

I've seen this clue in The Daily Express.
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