Australian city's extremely sorry cartoonist is sacked (6)
I believe the answer is:
sydney
'australian city's' is the definition.
(I've seen this before)
'extremely sorry cartoonist is sacked' is the wordplay.
'extremely sorry' becomes 'sy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cartoonist' becomes 'Disney' (Walt Disney).
'sacked' is a deletion indicator.
'disney' with 'is' taken away is 'dney'.
'sy'+'dney'='SYDNEY'
Can you help me to learn more?
(Other definitions for sydney that I've seen before include "- - Carton, 9 hero" , "Australian city with famous opera house" , "Largest Australian city" , "State capital of New South Wales" , "NSW capital" .)