Here is a good solution:
FUNCTION comma_to_table(iv_raw IN VARCHAR2) RETURN dbms_utility.lname_array IS
ltab_lname dbms_utility.lname_array;
ln_len BINARY_INTEGER;
BEGIN
dbms_utility.comma_to_table(list => iv_raw
,tablen => ln_len
,tab => ltab_lname);
FOR i IN 1 .. ln_len LOOP
dbms_output.put_line('element ' || i || ' is ' || ltab_lname(i));
END LOOP;
RETURN ltab_lname;
END;
Source: CSV - comma separated values - and PL/SQL (link no longer valid)