It goes for a self-centred person (6)
I believe the answer is:
egoist
'a self-centred person' is the definition.
(I've seen this before)
'it goes' is the wordplay.
'it goes' anagrams to 'EGOIST'.
Though, I'm not sure how the anagram is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for egoist that I've seen before include "Selfish type" , "ill with him to think of others" , "Man who thinks highly of himself" , "Self-absorbed person" , "Self-centred person with a swelled head" .)