Tough Dundee player downs cooking oil (8)
I believe the answer is:
hooligan
'tough' is the definition.
(I've seen this before)
'dundee player downs cooking oil' is the wordplay.
'dundee player' becomes 'hogan' (Paul Hogan played Crocodile Dundee).
'downs' indicates putting letters inside (down can mean to swallow).
'cooking' is an anagram indicator (cook can mean to falsify or distort).
'oil' with letters rearranged gives 'oli'.
'hogan' placed around 'oli' is 'HOOLIGAN'.
(Other definitions for hooligan that I've seen before include "Yobbo" , "A young ruffian" , "Destructive or badly-behaved youth" , "Antisocial rough" , "Tough" .)