In no atlas, strangely, will you find a country’s inhabitants (9)
I believe the answer is:
nationals
'a country's inhabitants' is the definition.
'in no atlas strangely' is the wordplay.
'strangely' is an anagram indicator.
'in'+'no'+'atlas'='innoatlas'
'innoatlas' is an anagram of 'NATIONALS'.
'will you find' is the link.
(Other definitions for nationals that I've seen before include "Natives" , "Subjects" , "Country folk" , "newspapers" , "citizens" .)