Despot part of one routine (4)
I believe the answer is:
nero
'despot' is the definition.
(I've seen this in another clue)
'part of one routine' is the wordplay.
'part of' indicates a hidden word.
'NERO' is hidden within 'one routine'.
(Other definitions for nero that I've seen before include "Emperor, 'burnt' Rome" , "Fiddling Roman emperor" , "Roman tyrant" , "Roman 9" , "Roman emperor, d. AD68" .)