Crossword Genius

In America, maybe fly quicker without one (6)

Ross

I believe the answer is:

zipper

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'in america maybe fly' is the definition.
(as in flies on trousers)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for zipper that I've seen before include "(Clothes) fastener (US)" , "pulled closer" , "Form of fastener" , "Fly" , "Type of fastener" .)

I've seen this clue in The Guardian.
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