Plot together (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
conspire
'plot together' is the definition.
(I've seen this in another clue)
This is all the clue.
(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)" .)