Plot together (8)
I believe the answer is:
conspire
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plot together</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for conspire that I've seen before include "Collude" , "'Plot, connive (8)'" , "implicated in plot" , "Secretly plan together" , "Plot together - on prices (anag)" .)