List of duties in area to remain on reflection (4)
I believe the answer is:
rota
'list of duties' is the definition.
(I've seen this before)
'in area to remain on reflection' is the wordplay.
'in' indicates the answer is hidden within the clue.
'on reflection' says the letters should be written in reverse.
'ator' is hidden in the letters of 'area to remain'.
'ator' written backwards gives 'ROTA'.
(Other definitions for rota that I've seen before include "Work roster" , "Working times list" , "Cycle of duty" , "List of people to do job in turns" , "Repetitious canon" .)