Rang me up about a nationality (6)
I believe the answer is:
german
'rang me up about a nationality' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for german that I've seen before include "Proper name for 2" , "Alsatian" , "Middle European, for example" , "European language" , "Manger (anag.)" .)