### Clue: Old writers echo identical passwords (4,6)
### Answer: OPEN SESAME 
 ### Explanation: Definition: passwords
 O(abbrev. for "old") + PENS(writer/writing instruments) + E(letter represented by "echo" in the phonetic alphabet) + SAME(identical).
Defn: … to gain admission or access. Originally from the phrase used by Ali Baba to open the 40 thieves' cave in the Arabian Nights collection of Middle Eastern folk tales