Crossword Genius

Public demonstration possibly skipping first bridge (4)

Ross

I believe the answer is:

arch

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

'bridge' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Leading figures" , "Shrewd; bridge" , "Chief; bow" , "Knowing, coy" , "Construction with a keystone" .)

I've seen this clue in The Times.
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