Complete change of direction (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">complete change of direction</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for u-turn that I've seen before include "Sharp reversal of direction" , "Complete reverse of car or attitude" , "Sudden complete change of plan" , "A complete reverse of direction" , "180 degrees change of direction" .)