German drug rubbish? Bother! (3,2)
I believe the answer is:
get at
'bother' is the definition.
(I know that bother can be written as get at)
'german drug rubbish?' is the wordplay.
'german' becomes 'g' (abbreviation).
'drug' becomes 'e' (E is another name for ecstasy).
'rubbish?' becomes 'tat' (tat can mean rubbish or poor-quality material).
'g'+'e'+'tat'='GET AT'
(Other definitions for get at that I've seen before include "Nobble; gain access to" , "Unfairly influence" , "Intend" , "Criticise (someone)" , "Reach - mean - attack verbally" .)