See when bird migrates to Vanuatu (3,8)
I believe the answer is:
new hebrides
'to vanuatu' is the definition.
(synonyms)
'see when bird migrates' is the wordplay.
'migrates' is an anagram indicator (I've seen 'migrate' mean this).
'see'+'when'+'bird'='seewhenbird'
'seewhenbird' is an anagram of 'NEW HEBRIDES'.
(Other definitions for new hebrides that I've seen before include "Islands which became Vanuatu" , "Former name of Vanuatu" .)