Crossword Genius

Rush to get US code (3)

Ross

I believe the answer is:

zip

I believe this is a double definition.

'rush' is the first definition.
(I know that rush is a more specific form of run)

'code' is the second definition.
(I know that ZIP is a type of code)

'to get us' acts as a link.

(Other definitions for zip that I've seen before include "Compress file for storage on disk < (or flash" , "Toothed fastener" , "required in open-and-shut case?" , "Locking device with two toothed edges and a sliding tab" , "Energy or clothes fastener" .)

I've seen this clue in The Mirror.
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