Heavenly food from the German nation (5)
I believe the answer is:
manna
'heavenly food' is the definition.
(as in manna from heaven)
'from the german nation' is the wordplay.
'from' indicates the answer is hidden within the clue.
'MANNA' can be found hidden inside 'the german nation'.
(Other definitions for manna that I've seen before include "Godsend" , "Free food (from heaven)" , "Miraculous substance from heaven" , "miraculously sustaining food" , "Food God gave to Moses" .)