A quiet worker, one in part of Ghana (7)
I believe the answer is:
ashanti
'part of ghana' is the definition.
(I've seen this in another clue)
'a quiet worker one' is the wordplay.
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'worker' becomes 'ant' (worker is a type of ant).
'one' becomes 'i' (Roman numeral).
'a'+'sh'+'ant'+'i'='ASHANTI'
'in' is the link.
(Other definitions for ashanti that I've seen before include "race" , "Ghanaian tribe" , "encountered somewhere in Ghana" , "some Africans" , "African people, mainly in Ghana" .)