Ground for conspiracy (4)
I believe the answer is:
plot
'conspiracy' is the definition.
(I've seen this in another clue)
'ground' is the wordplay.
I cannot really understand how this works, but
'ground' could be 'lot' (I've seen this in another clue) and 'lot' is found within the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for plot that I've seen before include "A scheme, or a parcel of land" , "Draw (graph)" , "intrigue" , "Graph; piece of ground" , "bed" .)