Father unhappy with European article about Californian city (8)
I believe the answer is:
pasadena
'californian city' is the definition.
(I've seen this before)
'father unhappy with european article about' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'unhappy' becomes 'sad' (associated in meaning).
'with european' becomes 'e' (abbreviation e.g. EU. I am not sure about the 'with' bit.).
'article' becomes 'an' (indefinite article).
'about' says the letters should be written in reverse.
'an' back-to-front is 'na'.
'pa'+'sad'+'e'+'na'='PASADENA'
(Other definitions for pasadena that I've seen before include "place in California" , "California city of the Rose Bowl stadium" , "city in 23 [CALIFORNIA]" , "City in Los Angeles County" , "US city" .)