A cat and a lion wandering round Spanish territory (9)
I believe the answer is:
catalonia
'spanish territory' is the definition.
'a cat and a lion wandering round' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'wandering' is an anagram indicator.
'round' indicates putting letters inside.
'cat' put after 'a' is 'acat'.
'acat'+'lion'='acatlion'
'acatlion' anagrammed gives 'catlonia'.
'a' inserted inside 'catlonia' is 'CATALONIA'.
(Other definitions for catalonia that I've seen before include "NE region of Spain" , "part of Spain" , "autonomous region" , "secessionist area" .)