Follow offender around Germany, making mess (4,6)
I believe the answer is:
dogs dinner
'mess' is the definition.
(I've seen this before)
'follow offender around germany' is the wordplay.
'follow' becomes 'dog' (dog can mean to follow or torment).
'offender' becomes 'sinner' (sinner is a kind of offender).
'around' is an insertion indicator.
'germany' becomes 'd' (vehicle registration code for Deutschland).
'sinner' placed around 'd' is 'sdinner'.
'dog'+'sdinner'='DOGS DINNER'
'making' is the link.
(Other definitions for dogs dinner that I've seen before include "Complete mess" , "Chum maybe" , "Very untidy thing" , "setter has to put away?" , "Setter could have prepared this" .)