Prostrate during assembly in Germany (5)
I believe the answer is:
lying
'prostrate' is the definition.
(I've seen this before)
'during assembly in germany' is the wordplay.
'during' indicates a hidden word.
'LYING' is hidden in the letters of 'assembly in germany'.
(Other definitions for lying that I've seen before include "Deceitful" , "Prone - mendacity" , "Telling fibs" , "Mendacious; recumbent" , "not to be trusted?" .)