Break the law joining National Front from a German party (4,4)
I believe the answer is:
sinn fein
'party' is the definition.
(I've seen this before)
'break the law joining national front from a german' is the wordplay.
'break the law' becomes 'sin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'joining' is a charade indicator (letters next to each other).
'national' becomes 'n' (abbreviation listed in Chambers).
'front' suggests taking the first letters.
'a german' becomes 'ein' ('a' in German).
The first letter of 'from' is 'f'.
'sin'+'n'+'f'+'ein'='SINN FEIN'
Can you help me to learn more?
(Other definitions for sinn fein that I've seen before include "Gerry Adams's party" , "Irish political movement" , "Political party to be found in fine inns" , "GerryAdams's political party" , "Fine inns (anag.)" .)