Flip of a coin (4)
I believe the answer is:
toss
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flip of a coin</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 toss that I've seen before include "Throw (coin or caber)" , "Raise a bit of money before opening" , "Throw with a light motion" , "Lob" , "Ship's movement" .)