Lead-in to "Latin" (3)
I believe the answer is:
neo
'lead-in to latin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for neo that I've seen before include "Prefix meaning new, maybe one" , "New (suffix)" , "language" , "Prefix meaning new or recent" , "Prefix donating new" .)