Hang together (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hang together</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 "Stick firmly together" , "Stick or hold together and resist separation" , "Even; without jerks" , "Fit together" , "Fuse together" .)