Tie together (4)
I believe the answer is:
bind
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tie 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 bind that I've seen before include "Wrap tightly - nuisance" , "Senior figure" , "Join or fasten together" , "difficult situation" , "Restrict" .)