I get the impression he has a Motorola Droid, and wants the clock app from the Hero. However, since it's a widget, I'm not certain its as easy as just loading an APK, plus I'm of the opinion that we shouldn't be condoning running HTC apps on Motorola devices (and vice versa) as we may end up with another Cyanogen/Google like take down notice.
EDIT: After posting this, I notice that the OP has a Sprint Hero. Surely the clock is exactly the same???