Conspire or plot (7)
I believe the answer is:
connive
I believe this is a double definition.
'conspire' is the first definition.
(I've seen this in another clue)
'plot' is the second definition.
(I know that connive is a more specific form of the action plot)
(Other definitions for connive that I've seen before include "Intrigue, scheme" , "Plot, conspire" , "Conspire; wink (at 2)" , "Plot secretly" , "Conspire (to do something harmful)" .)