Performing law in Germany originally (6)
I believe the answer is:
acting
'performing' is the definition.
(acting is a kind of performing)
'law in germany originally' is the wordplay.
'law' becomes 'act' (I've seen this before).
'originally' indicates taking the first letters.
The first letter of 'germany' is 'g'.
'act'+'in'+'g'='ACTING'
(Other definitions for acting that I've seen before include "Behaving like thespian" , "Performing the role of" , "Taking a part - on a temporary basis" , "Performing on stage" , "Feigning" .)