In California, hatred is stirring and building (9)
I believe the answer is:
cathedral
'building' is the definition.
(cathedral is a kind of building)
'in california hatred is stirring' is the wordplay.
'in' means one lot of letters goes inside another.
'california' becomes 'cal' (short for California).
'is stirring' indicates an anagram.
'hatred' anagrammed gives 'thedra'.
'cal' going around 'thedra' is 'CATHEDRAL'.
'and' acts as a link.
(Other definitions for cathedral that I've seen before include "See building" , "Principal Christian church in a diocese" , "Halted car, badly, at the important church" , "Head church of diocese" , "Where one worships" .)