Dodgy oil trade involving international leader (9)
I believe the answer is:
editorial
'leader' is the definition.
(I've seen this before)
'dodgy oil trade involving international' is the wordplay.
'dodgy' indicates anagramming the letters.
'involving' means one lot of letters goes inside another.
'international' becomes 'i' (abbreviation eg in IMF).
'oil'+'trade'='oiltrade'
'oiltrade' with letters rearranged gives 'edtorial'.
'edtorial' going around 'i' is 'EDITORIAL'.
(Other definitions for editorial that I've seen before include "Paper's opinion piece" , "leader, perhaps" , "considered view on paper" , "Article giving opinion of a newspaper" , "bit of paper" .)