Crossword Genius

Leader going on demo in Bow (4)

Ross

I believe the answer is:

arch

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'bow' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Consummate" , "Bridge span" , "Foremost" , "Marble, for example" , "Curved bony structure in the foot" .)

I've seen this clue in The Sun.
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