Fall over (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fall over</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tumble that I've seen before include "Roll over and over like acrobat or pigeon" , "Fall, roll, twist" , "Fall awkwardly" , "Fall clumsily" , "Fall helplessly or headlong" .)
(Other definitions for keel that I've seen before include "Lengthwise structure of a ship" , "Part of ship's frame" , "Part of ship's hull" , "ridge" , "Structure along base of ship" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fall over</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 tip that I've seen before include "Useful hint; end" , "present!" , "Gratuity or light touch" , "Pointed extremity" , "Clue" .)