Separated man returning, having felt pain (8)
I believe the answer is:
detached
'separated' is the definition.
(I know that separated can be written as detached)
'man returning having felt pain' is the wordplay.
'man' becomes 'ted' (Ted is a man's name).
'returning' says the letters should be written backwards.
'having' is a charade indicator (letters next to each other).
'felt pain' becomes 'ached' (I've seen this in another clue).
'ted' written backwards gives 'det'.
'det'+'ached'='DETACHED'
(Other definitions for detached that I've seen before include "Separate; aloof" , "Separated from - maybe a house" , "isolated" , "Not committed, objective" , "free of ties" .)