Crossword Genius

(Moving) there then back again repeatedly (2,3,3)

Ross

I believe the answer is:

to and fro

(Other definitions for to and fro that I've seen before include "This way and that, back and forth" , "Directions of oscillation" , "From place to place" , "Backwards and forwards" , "Shuttle's motion" .)

I've seen this clue in The Times.
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