Slanting type (6)
I believe the answer is:
'slanting type' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for italic that I've seen before include "Print style used for emphasis, titles of books, etc" , "A letter in sloping type" , "Type used for stress" , "Printed in a sloping type" , "Handwriting style" .)