I get proper treatment for being so selfish (3-7)

I believe the answer is:

ego-tripper

I'm a little stuck... Click here to teach me more about this clue!

'being so selfish' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'i get proper treatment' is the wordplay.
'treatment' is an anagram indicator (letters treated or processed differently).
'i'+'get'+'proper'='igetproper'
'igetproper' is an anagram of 'EGO-TRIPPER'.

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.