Tail movements (4)
I believe the answer is:
wags
'tail movements' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for wags that I've seen before include "Habitual jokers" , "Moves to and fro like dog's tail" , "Moves briskly to and fro with swag (4)" , "group with team players, esp when travelling" .)