Cut made in Gatsby vehicle (6)
I believe the answer is:
jalopy
'vehicle' is the definition.
(I know that jalopy is a type of motor car)
'cut made in gatsby' is the wordplay.
'cut' becomes 'lop' (lopping is a kind of cutting).
'made in' indicates putting letters inside.
'gatsby' becomes 'jay' (I've seen this in another clue).
'lop' put into 'jay' is 'JALOPY'.
(Other definitions for jalopy that I've seen before include "Old worn-out car" , "wreck" , "Dilapidated car (colloq.)" , "A battered old car" , "Old banger" .)