Egotistical (4)
'egotistical' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for selfish that I've seen before include "Putting own interests first" , "Concerned chiefly with one's own interests" , "Egotistical" , "Ungenerous" , "Concerned only with oneself" .)
'egotistical' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for vain that I've seen before include "Conceited, arrogant" , "is full of himself" , "Producing no result" , "Stuck-up? It's hopeless" , "Conceited and ineffectual" .)