A regulation dividing military intelligence in this African country (6)
I believe the answer is:
malawi
'this african country' is the definition.
(country in Africa)
'a regulation dividing military intelligence' is the wordplay.
'regulation' becomes 'law' (I've seen this before).
'dividing' means one lot of letters goes inside another (inserted letters divide the word).
'military intelligence' becomes 'MI' (as in MI5 or MI6 - British military intelligence).
'a'+'law'='alaw'
'alaw' going inside 'mi' is 'MALAWI'.
'in' is the link.
(Other definitions for malawi that I've seen before include "Landlocked country of south central Africa" , "Republic" , "Country to west of Lake Nyasa" , "Landlocked African country" , "East African country" .)