Inclined to excuse four implicated in fakery (9)
I believe the answer is:
forgiving
'inclined to excuse' is the definition.
'four implicated in fakery' is the wordplay.
'four' becomes 'iv' ('IV' can be a synonym of 'four').
'implicated in' is an insertion indicator.
'fakery' becomes 'forging'.
'iv' put into 'forging' is 'FORGIVING'.
(Other definitions for forgiving that I've seen before include "Giving pardon" , "Excusing" , "Ready to excuse" , "Pardoning" , "Lenient" .)