Alien and ET do lunar dance (9)
I believe the answer is:
outlander
'alien' is the definition.
(both can mean a foreigner or stranger)
'et do lunar dance' is the wordplay.
'dance' indicates anagramming the letters.
'et'+'do'+'lunar'='etdolunar'
'etdolunar' anagrammed gives 'OUTLANDER'.
'and' is the link.
(Other definitions for outlander that I've seen before include "stranger" , "No local" .)