Effect of independent member introducing law (6)
I believe the answer is:
impact
'effect' is the definition.
(impact is a kind of effect)
'independent member introducing law' is the wordplay.
'independent' becomes 'i'.
'member' becomes 'mp'.
'introducing' says to put letters next to each other.
'law' becomes 'act' (I've seen this before**).
'i'+'mp'+'act'='IMPACT'
'of' acts as a link.
(Other definitions for impact that I've seen before include "The force of one body against another" , "Repercussions" , "Forcible contact between two things" , "Forceful consequence" , "Serious effect" .)