Form a whole (6)
I believe the answer is:
cohere
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form a whole</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 cohere that I've seen before include "Hold firmly together" , "Stick or hold together and resist separation" , "Cling" , "Hang together" , "Form a whole" .)