In Oz, rabbit and retired horse live by river (6)
I believe the answer is:
yabber
'in oz rabbit' is the definition.
The definition suggests a singular noun which matches the answer.
'retired horse live by river' is the wordplay.
'retired' says the letters should be written in reverse.
'horse' becomes 'bay' (bay is a kind of horse).
'live' becomes 'be' (synonyms).
'by' means one lot of letters go next to another.
'river' becomes 'r' (abbreviation for river).
'bay' in reverse letter order is 'yab'.
'yab'+'be'+'r'='YABBER'
'and' is the link.
Can you help me to learn more?
(Other definitions for yabber that I've seen before include "Conversation in Sydney" , "rabbit on" , "Chatter" .)