Region seeing a listener finally getting promoted (4)
I believe the answer is:
area
'region' is the definition.
('area' can be a synonym of 'region')
'a listener finally getting promoted' is the wordplay.
'finally' indicates one should take the final letters.
'getting' is a charade indicator (letters next to each other).
'promoted' becomes 'ea' (I can't explain this - if you can you should believe this answer much more).
The last letter of 'listener' is 'r'.
'a'+'r'+'ea'='AREA'
'seeing' acts as a link.
Can you help me to learn more?
(Other definitions for area that I've seen before include "Extent of a two-dimensional surface" , "Part of a building, city etc" , "Locality" , "topic" , "Space occupied by something" .)