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