Be the boss of some foreigners (5)
I believe the answer is:
reign
'be the boss' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'some foreigners' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'REIGN' is hidden within 'foreigners'.
'of' is the link.
Can you help me to learn more?
(Other definitions for reign that I've seen before include "Niger (anag)" , "Period of a monarchy" , "Rule over in Niger" , "Sit on a throne" , "Monarch's time in the job" .)