Two happy dogs heard in city on the Murrumbidgee (5,5)
I believe the answer is:
wagga wagga
'dogs heard in city on the murrumbidgee' is the definition.
I can't judge whether this defines the answer.
'two happy' is the wordplay.
'two' shows that letters should be duplicated.
'happy' becomes 'wagga' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wagga' duplicated is 'WAGGA WAGGA'.
Can you help me to learn more?
(Other definitions for wagga wagga that I've seen before include "town in Australia" , "city in Australia?" .)