Map pinpointing Libya and Nigeria, primarily (4)
I believe the answer is:
plan
'map' is the definition.
(I've seen this in other clues)
'pinpointing libya and nigeria primarily' is the wordplay.
'primarily' says to take the initial letters.
The first letters of 'pinpointing libya and nigeria' is 'PLAN'.
(Other definitions for plan that I've seen before include "chart" , "Scale drawing of a structure" , "Stratagem" , "Scheme to achieve something" , "Schedule" .)