I have never heard the "clock face" referred to as the "clock screen" in English, but then I don't get the time from the latest, constantly held in my hand smart phone.
Dial should also be accepted, but isn't.
This is not really possible English. A watch has a "face" or "cover". "Screen" is used for TVs and computers.
Hello Duolingo robot. Can you correct this please? No clock has a screen - it has a face. This is simply not said.
Ditto. Maybe translation should be: "Fața de ceas nu este curată"?