There's Term::Cap which would let you find the current terminal's clear-to-end-of-line which you could print after your CR.
Of course if you want to go the whole way there's also Curses.
Update: The other solutions hard coding VT100-esque sequences are going to work on probably 70+% of the terminals you'll encounter (xterm, kconsole, iTerm, et al), but use Term::Cap if you want to make sure you work regardless of the terminal (presuming correct entries in the system's termcap file :).
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