Dictator worked in fine company (6)
I believe the answer is:
franco
'dictator' is the definition.
(Spanish dictator Francisco Franco)
'worked in fine company' is the wordplay.
'worked' becomes 'ran' (eg a machine that works is running).
'in' is an insertion indicator.
'fine' becomes 'f' (abbreviation).
'company' becomes 'co' (abbreviation).
'f'+'co'='fco'
'ran' placed within 'fco' is 'FRANCO'.
(Other definitions for franco that I've seen before include "Former Spanish leader" , "Former Spanish dictator" , "was head of state" , "Spanish general and dictator" , "Last dictator of Spain" .)