The German, upset and miserable (3)
I believe the answer is:
sad
'miserable' is the definition.
(similar in meaning)
'the german upset' is the wordplay.
'the german' becomes 'das' ('the' in German).
'upset' is a reversal indicator.
'das' backwards is 'SAD'.
'and' acts as a link.
(Other definitions for sad that I've seen before include "Winter blues, initially" , "Tragic" , "Melancholy, downhearted" , "upset" , "Dejected" .)