3 down
Common
direction
of
travel
after
they
open
border
fronts
(1,2,1)
Common direction of travel after they open border fronts (1,2,1)
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The definition is at the beginning of the clue.
How the clue works
Look at Common direction of travel — that's your definition, the familiar phrase for getting from one place to another. Then "fronts" tells you to take the first letters of after they open border, giving you A, T, O, B — which is exactly what you're after.