Some categorise personal pride (3)
I believe the answer is:
ego
'personal pride' is the definition.
(I've seen this before)
'some categorise' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'EGO' is hidden in the letters of 'categorise'.
(Other definitions for ego that I've seen before include "In Virgil I" , "Conscious mind" , "One's image of oneself" , "Conscious self" , "One's sense of self-importance" .)