The old cat's country (4)
I believe the answer is:
siam
'country' is the definition.
(Siam is an example)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for siam that I've seen before include "Former name of Thailand" , "Old Thailand" , "old-style country" , "Thailand's former name" , "An old country" .)