Crossword Genius

Bow demo leader cancelled (4)

Ross

I believe the answer is:

arch

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

'bow' is the definition.
(both can mean to curve)

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 "Curved span" , "Roguish - chief - supporter" , "Chief - supporter - cunning" , "Supporting structure" , "Affectedly playful (4)" .)

I've seen this clue in The Sun.
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