At start have every relevant enactment before you as result of this (6)
I believe the answer is:
hereby
'as result of this' is the definition.
(hereby means 'as a result' or 'through this')
'at start have every relevant enactment before you' is the wordplay.
'at start' suggests taking the first letters.
The initial letters of 'have every relevant enactment before you' is 'HEREBY'.
(Other definitions for hereby that I've seen before include "Not far off" , "By this means or act" , "By this means, as result of this" , "(Formally) with this" , "By means of this, legally speaking" .)