Crossword Genius

Say it goes fast (7)

Ross

I believe the answer is:

express

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'fast' 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 express that I've seen before include "set forth" , "Transport" , "Explicit" , "Quickly" , "Fast - state - train" .)

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