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No, clrscr(), Nothing like it.
If you're working with display files, when you write the next screen it typically replaces the previous one.
Perhaps you can tell us what's happening and what you want to occur.
A function very similar to clrscr() is available, but it's only meaningful if you're doing screen I/O similar to how C does it. And since clrscr() is not part of the C standard and supplied with only some C compilers through a non-standard library, i.e., conio.h, you can always create your own version.
It would probably be better if you explained the need to show a totally blank screen through normal RPG. Screens are almost always blanked when displaying a new record unless you use options that force existing data to remain.
If we knew more about why you need clrscr(), we might suggest simpler alternatives.