Disloyal person giving corrupt trio art (7)
I believe the answer is:
traitor
'disloyal person' is the definition.
(I've seen this before)
'corrupt trio art' is the wordplay.
'corrupt' is an anagram indicator (a corrupted spelling of the word).
'trio'+'art'='trioart'
'trioart' with letters rearranged gives 'TRAITOR'.
'giving' is the link.
(Other definitions for traitor that I've seen before include "Maclean was one" , "Person betraying a cause" , "defector?" , "Unreliable type" , "Betrayer of a country" .)