One getting rid of retired male model (8)

I believe the answer is:

disposer

'one getting rid of' is the definition.
(someone who disposes of things)

'retired male model' is the wordplay.
'retired' shows that the letters should be reversed in order.
'male' becomes 'Sid' (man's name).
'model' becomes 'poser' (synonyms).
'sid' back-to-front is 'dis'.
'dis'+'poser'='DISPOSER'

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app