Article that has trashed RUC is too shocking (9)
I believe the answer is:
atrocious
'shocking' is the definition.
(I've seen this before)
'article that has trashed ruc is too' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'that has' means one lot of letters go next to another.
'trashed' is an anagram indicator (I've seen this in other clues).
'ruc'+'is'+'too'='rucistoo'
'rucistoo' with letters rearranged gives 'trocious'.
'a'+'trocious'='ATROCIOUS'
(Other definitions for atrocious that I've seen before include "Horrifying" , "Appallingly bad" , "Shocking" , "Extremely wicked" , "Horrifyingly wicked" .)