Kind of bond (5)
I believe the answer is:
ionic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kind of bond</span>' is the definition.<br/ ><span class="explanation-format__explanation">(type of chemical bond)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ionic that I've seen before include "in ancient Greece?" , "Style of Greek architecture" , "Greek architectural style" , "Classical dialect" , "Like some Greek architecture" .)