A legal right for a foreigner (5)
I believe the answer is:
alien
'foreigner' is the definition.
(synonyms)
'a legal right for a' is the wordplay.
'a legal right' becomes 'lien' (type of property right).
'for' says to put letters next to each other (I've seen this in other clues).
'lien' put after 'a' is 'ALIEN'.
(Other definitions for alien that I've seen before include "Foreign; extraterrestrial" , "Foreign (from outer space?)" , "Stranger" , "Foreign, strange" , "ET" .)