Crossword Genius

Proceed during rush hour, say (5)

Ross

I believe the answer is:

creep

(Other definitions for creep that I've seen before include "Move silently and secretly" , "Move slowly and stealthily" , "Advance slowly and stealthily" , "wretch" , "Cringing, unpleasant person (slang)" .)

I've seen this clue in The New York Times.
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