Quite pleased with oneself (4)
I believe the answer is:
smug
'quite pleased with oneself' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for smug that I've seen before include "Arrogantly self-satisfied" , "Unctuous" , "Twisted; quirky" , "Irritatingly pleased with oneself" , "Self-satisfied, complacent" .)