Bad blood from European with German in New York (6)
I believe the answer is:
enmity
'bad blood' is the definition.
(I've seen this before)
'european with german in new york' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'with german' becomes 'mit'.
'in' indicates putting letters inside.
'new york' becomes 'ny'.
'mit' put within 'ny' is 'nmity'.
'e'+'nmity'='ENMITY'
'from' acts as a link.
(Other definitions for enmity that I've seen before include "discord" , "Antagonism, ill-will" , "Hostility between opposing people or countries" , "Hostility, ill-will" , "Animus" .)