Territory over there outside the UK (5)
I believe the answer is:
yukon
'territory' is the definition.
(Canadian territory)
'over there outside the uk' is the wordplay.
'over there' becomes 'yon' (archaic word meaning 'over there').
'outside' indicates putting letters inside (some letters go outside others).
'yon' placed around 'uk' is 'YUKON'.
(Other definitions for yukon that I've seen before include "Territory of northwest Canada" , "Canadian region" , "Canadian Gold Rush area" , "River in northern Canada" , "NW Canadian territory" .)