The French emperor’s land in Africa (7)
I believe the answer is:
lesotho
'land in africa' is the definition.
(African country)
'the french emperor's' is the wordplay.
'the french' becomes 'les' ('the' in French).
'emperor' becomes 'Otho' (Roman emperor).
'les'+'otho'='LESOTHO'
(Other definitions for lesotho that I've seen before include "South African kingdom" , "Country, an enclave of South Africa, capital Maseru" , "Country entirely within South Africa" , "African country, formerly Basutoland" , "Independent kingdom, an enclave of South Africa" .)