Sway; oscillate (5)
I believe the answer is:
swing
This clue is a double definition.
'sway' is the first definition.
(I know that sway can be written as swing)
'oscillate' is the second definition.
(I've seen this in another clue)
(Other definitions for swing that I've seen before include "Sway to and fro" , "Music; hanging seat" , "Change opinion" , "in the park?" , "Hanging seat, jazz style" .)