European abandoning European tribe (3)
I believe the answer is:
dan
'tribe' is the definition.
(one of the Tribes of Israel)
'european abandoning european' is the wordplay.
'european' becomes 'Dane' (someone from Denmark).
'abandoning' indicates named letters should be taken away.
'european' becomes 'E' (abbreviation e.g. EU).
'dane' with 'e' removed is 'DAN'.
(Other definitions for dan that I've seen before include "Black-belt grade of proficiency" , "Judo, karate level" , "Karate expert" , "Grade level in judo" , "Judo level and Wicklow lake" .)