Emphatic letters come from Venetian, perhaps, though last two are ignored by contrary lawyer (7)
I believe the answer is:
italics
'emphatic letters' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for italics that I've seen before include "Typeface with letters slanting to the right" , "Sloping typefaces" , "Letters slanted to the right" , "List CIA with letters that slant" , "Type with slanting letters" .)