Leave with one animal (3)
I believe the answer is:
goa
'animal' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'leave with one' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'with' means one lot of letters go next to another.
'one' becomes 'a' (a thing is one thing).
'go'+'a'='GOA'
Can you help me to learn more?
(Other definitions for goa that I've seen before include "Former Portuguese colony on India's west coast" , "Indian W. coast state" , "holiday destination in Asia" , "State of SW India" , "Indian state, formerly Portuguese" .)