Din from Californian city doctor bitten by dog (7)
I believe the answer is:
clamour
'din' is the definition.
(I've seen this before)
'californian city doctor bitten by dog' is the wordplay.
'californian city' becomes 'la'.
'doctor' becomes 'mo' (medical officer).
'bitten by' means one lot of letters goes inside another (I've seen this in other clues).
'dog' becomes 'cur' (both can mean a despicable person).
'la'+'mo'='lamo'
'lamo' put into 'cur' is 'CLAMOUR'.
'from' is the link.
(Other definitions for clamour that I've seen before include "Loud confused noise" , "racket" , "Noisy disturbance" , "Loud noise of shouting" , "Hue and cry" .)