Swing to and fro (4)

I think it could be either:

sway

flap

'swing to and fro' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sway that I've seen before include "Move back and forth" , "Ways to waver in opinion or posture" , "Control" , "Vacillate" , "Totter; influence" .)

I've seen this clue in The Mirror, The Daily Mail and the Evening Standard.

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