Hand signal (4)
I believe the answer is:
wave
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hand signal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wave that I've seen before include "Breaker; hand gesture" , "Hand signal; surge" , "Roller - breaker" , "Flourish" , "Shake a hand in the air" .)