Problems in Bundestag growing (5)
I believe the answer is:
aggro
'problems' is the definition.
(I've seen this before)
'in bundestag growing' is the wordplay.
'in' says the answer is hidden in the clue.
'AGGRO' is hidden in the letters of 'bundestag growing'.
(Other definitions for aggro that I've seen before include "Greek consumed by past" , "Difficulties (sl.)" , "Violence - problems" , "Difficulties, trouble" , "Violent disturbance" .)