Effect of current law on politician (6)
I believe the answer is:
impact
'effect' is the definition.
(I know that impact is a type of effect)
'current law on politician' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'law' becomes 'act' (I've seen this before).
'on' means one lot of letters go next to another.
'politician' becomes 'MP' (Member of Parliament).
'act' after 'mp' is 'mpact'.
'i'+'mpact'='IMPACT'
'of' acts as a link.
(Other definitions for impact that I've seen before include "Strong effect" , "Impression" , "Forcible contact; marked influence" , "The force fo violent strike" , "Result" .)