Loyalist beginning to accept law-breaking (8)
I believe the answer is:
stalwart
'loyalist' is the definition.
('stalwart' can be a synonym of 'loyalist')
'beginning to accept law-breaking' is the wordplay.
'beginning' becomes 'start' (start is a kind of beginning).
'to accept' indicates putting letters inside.
'breaking' indicates an anagram.
'law' with letters rearranged gives 'lwa'.
'start' going around 'lwa' is 'STALWART'.
(Other definitions for stalwart that I've seen before include "Steadfast" , "Determined" , "Valiant" , "Strong and reliable" , "Loyal servant" .)