Overseer in favour of name change (7)
I believe the answer is:
foreman
'overseer' is the definition.
(thesaurus)
'in favour of name change' is the wordplay.
'in favour of' becomes 'for' (I've seen this before**).
'change' is an anagram indicator.
'name' with letters rearranged gives 'eman'.
'for'+'eman'='FOREMAN'
(Other definitions for foreman that I've seen before include "Male supervisor" , "Charge hand" , "Fellow in charge" , "Supervising worker" , "Gaffer, boss" .)