Assistant in Dubai demoted (4)
I believe the answer is:
aide
'assistant' is the definition.
(aide is a kind of assistant)
'in dubai demoted' is the wordplay.
'in' indicates a hidden word.
'AIDE' is hidden within 'dubai demoted'.
(Other definitions for aide that I've seen before include "Officer who acts as military assistant" , "Second" , "Right-hand man/woman" , "a help" , "Military officer acting as assistant" .)