Ignore Nationalist and choose to welcome German (7)
I believe the answer is:
neglect
'ignore' is the definition.
(I know that ignore can be written as neglect)
'nationalist and choose to welcome german' is the wordplay.
'nationalist' becomes 'n' (abbreviation in politics).
'and' means one lot of letters go next to another.
'choose' becomes 'elect' (electing is a kind of choosing).
'to welcome' indicates putting letters inside (inserted letters are welcomed in).
'german' becomes 'g' (abbreviation).
'elect' enclosing 'g' is 'eglect'.
'n'+'eglect'='NEGLECT'
(Other definitions for neglect that I've seen before include "forget" , "Fail to pay due attention to (7)" , "Let slide" , "Lack of proper care" , "Failure to observe" .)