Socialist, without ceremony, rejected left (7)
I believe the answer is:
Here is my best explanation:
'socialist' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?
'without ceremony rejected left' is the subsidiary indication.
'without' is an insertion indicator.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'rejected' says the letters should be written in reverse.
'left' becomes 'red' (I've seen this in other clues**).
'rite' written backwards gives 'etir'.
'etir' put into 'red' is 'retired'.
(Other definitions for retired that I've seen before include "claiming a pension?", "Went to bed or gave up work", "Turned in", "Ceased working", "went back", "withdrawn", "Left", "out of office?", "Gave up work" and "Put out to pasture".)