Supervisor, one in favour of Oriental worker (7)
I believe the answer is:
foreman
'supervisor' is the definition.
(foreman is a kind of supervisor)
'one in favour of oriental worker' is the wordplay.
'one in favour of' becomes 'for' (I've seen this before).
'oriental' becomes 'e'.
'worker' becomes 'man' (man is a kind of worker).
'for'+'e'+'man'='FOREMAN'
(Other definitions for foreman that I've seen before include "Gaffer, boss" , "Supervising worker" , "spokesman" , "Male supervisor" , "Fellow in charge" .)