Self-admirer in prison after setback? A no, I'm sorry (9)
I believe the answer is:
egomaniac
'self-admirer' is the definition.
I can't tell whether this defines the answer.
'in prison after setback? a no i'm sorry' is the wordplay.
'in' indicates putting letters inside.
'prison' becomes 'cage' (cage is a kind of prison).
'after setback?' says the letters should be written in reverse (I've seen 'after setback' mean this).
'sorry' indicates anagramming the letters (sorry can mean poor-quality or wretched).
'cage' back-to-front is 'egac'.
'a'+'no'+'im'='anoim'
'anoim' is an anagram of 'omani'.
'egac' placed around 'omani' is 'EGOMANIAC'.
Can you help me to learn more?
(Other definitions for egomaniac that I've seen before include "who's full of himself" , "Come again (anag.)" , "Excessively self-concerned person" , "Oneself, one would love" , "Excessively self-absorbed person" .)