Article on lawbreaking in Black Sea peninsula (6)
I believe the answer is:
crimea
'black sea peninsula' is the definition.
(I've seen this in another clue)
'article on lawbreaking' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'on' means one lot of letters go next to another.
'lawbreaking' becomes 'crime' (I've seen this before).
'a' put after 'crime' is 'CRIMEA'.
'in' acts as a link.
(Other definitions for crimea that I've seen before include "1853-56 war zone" , "part of the Ukraine" , "High-quality black tea" , "Black Sea region" , "Peninsula, scene of war 1853-56" .)