Crossword Genius

A span of roguishness (4)

Ross

I believe the answer is:

arch

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Cunning; span" , "(archaic)" , "Curved form" , "Mischievous - shrewd" , "Way though - on foot!" .)

I've seen this clue in The Globe and Mail.
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