Map-maker and former president in possession of round plot (12)
I believe the answer is:
cartographer
'map-maker' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cartographer that I've seen before include "Map-maker" , "Map maker" , "One making maps" , "one making plans" .)