Self-centred European obtained first integrated circuit (9)
I believe the answer is:
egotistic
'self-centred' is the definition.
(I've seen this before)
'european obtained first integrated circuit' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'obtained' becomes 'got' ('get' can be a synonym of 'obtain').
'first' becomes 'ist' (ist resembles 1st).
'integrated circuit' becomes 'ic' (abbreviation in electronics).
'e'+'got'+'ist'+'ic'='EGOTISTIC'
(Other definitions for egotistic that I've seen before include "Self-centred" , "self-absorbed" .)