Crossword Genius

In constant movement backwards and forwards (2,3,3)

Ross

I believe the answer is:

to and fro

(Other definitions for to and fro that I've seen before include "Back and forth like pendulum (2.3.3)" , "Directions of oscillation" , "both ways" , "From place to place" , "Backwards and forwards" .)

I've seen this clue in The Irish Times.
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