Columbo actor wins round director in overseas territory (8,7)
I believe the answer is:
falkland islands
'director in overseas territory' is the definition.
The definition suggests a singular noun which matches the answer.
'columbo actor wins' is the wordplay.
'columbo' becomes 'falk' (I've seen this in another clue).
'actor' becomes 'landis' (I can't justify this - if you can you should believe this answer much more).
'wins' becomes 'lands' (both can mean to obtain or secure).
'falk'+'landis'+'lands'='FALKLAND ISLANDS'
'round' is the link.
Can you help me to learn more?
(Another definition for falkland islands that I've seen is " British possession in the South Atlantic".)