Type of knot (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">type of knot</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 reef that I've seen before include "Ridge of rock or sand just below sea surface" , "Free (anag.)" , "portion of sail" , "Underwater ridge or kind of knot" , "Coral structure" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">type of knot</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for bowline that I've seen is " Rope".)