Pig-headed group scheme (4)

I believe the answer is:

plot

I'm a little stuck... Click here to teach me more about this clue!

'scheme' is the definition.
(I know this)

'pig-headed group' is the wordplay.
'pig-headed' becomes 'p' (this might be a standard abbreviation which I don't know about).
'group' becomes 'lot'.
'p'+'lot'='PLOT'

Can you help me to learn more?

(Other definitions for plot that I've seen before include "Story or piece of land" , "Film story; graph" , "Novel story - secret plan" , "Small area of ground" , "cook up" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.