Larks in a strange land (3,5)
I believe the answer is:
sri lanka
'land' is the definition.
(I know that Sri Lanka is a land)
'larks in a strange' is the wordplay.
'strange' is an anagram indicator.
'larks'+'in'+'a'='larksina'
'larksina' is an anagram of 'SRI LANKA'.
(Other definitions for sri lanka that I've seen before include "Island country in the Indian Ocean" , "Island by Southern India" , "'Formerly Ceylon (3,5)'" , "[TEST TEAM]" , "It used to be called Ceylon" .)