A little bit of egotism or selfishness (6)
I believe the answer is:
morsel
'a little bit' is the definition.
(I've seen this in another clue)
'of egotism or selfishness' is the wordplay.
'of' says the answer is hidden in the clue.
'MORSEL' can be found hidden inside 'egotism or selfishness'.
(Other definitions for morsel that I've seen before include "Scrap, fragment" , "Small amount of food, a bite" , "Small mouthful of food" , "A tiny bit" , "A small amount of food, just a piece" .)