Breakfast food for one German (3)
I believe the answer is:
egg
'breakfast food' is the definition.
(I've seen this before)
'for one german' is the wordplay.
'for one' becomes 'eg' (both can mean 'for example').
'german' becomes 'g' (abbreviation).
'eg'+'g'='EGG'
(Other definitions for egg that I've seen before include "explosive" , "start in life" , "Bird's first home" , "Reproductive cell" , "Urge (someone on )" .)