Pigheaded group conspiracy (4)
I believe the answer is:
plot
'conspiracy' is the definition.
(I've seen this before)
'pigheaded group' is the wordplay.
'pigheaded' becomes 'p' (this might be a standard abbreviation of which I'm unaware).
'group' becomes 'lot'.
'p'+'lot'='PLOT'
Can you help me to learn more?
(Other definitions for plot that I've seen before include "Graph; piece of ground" , "Contrive" , "Conspire - small piece of land" , "Design" , "Small piece of ground" .)