The German goes back and slices bread for Barbarossa (8)

'barbarossa' is the definition.
I know nothing about this answer so I can't tell whether this works.

'the german goes back and slices bread' is the wordplay.
'the german' becomes 'der' ('the' in German).
'goes back' says the letters should be written in reverse.
'and' is a charade indicator (letters next to each other).
'slices' indicates an anagram.
'der' back-to-front is 'red'.
'bread' with letters rearranged gives 'beard'.
'red'+'beard'='REDBEARD'

'for' is the link.

Can you help me to learn more?