"Your turn," on a walkie-talkie (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">your turn on a walkie-talkie</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for over that I've seen before include "settled" , "In the sky?" , "Directly above" , "Having gone < to America" , "Finished, done" .)