See good in some oddly lacking self-centredness (6)
I believe the answer is:
egoism
'self-centredness' is the definition.
(I've seen this before)
'see good in some oddly lacking' is the wordplay.
'see good' becomes 'ego' (I can't explain this - if you can you should believe this answer much more).
'oddly lacking' indicates alternate letters (letters in odd-numbered positions removed).
'in'+'some'='insome'
The alternating letters of 'insome' are 'ism'.
'ego'+'ism'='EGOISM'
Can you help me to learn more?
(Other definitions for egoism that I've seen before include "self-centred doctrine" , "Self-centredness, vanity" , "principle of self-interest" , "Self-centredness, conceit" , "Excessive self-regard" .)