Crossword Genius

Records omitting Brunel's section of bridge, perhaps (4)

Ross

I believe the answer is:

arch

'section of bridge perhaps' is the definition.
(a bridge's structure may include an arch)

I don't understand how the rest of the clue works.

(Other definitions for arch that I've seen before include "architectural feature" , "Bend into upward curve" , "Roguish - superior" , "Masonry construction for spanning an opening" , "Cunning; span" .)

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