Currently clearcasts from omen are being used by nourish in Cata Classic.
This is not supposed to be the case. According to patch notes that was changed in 4.0.3a. It wastes a mana saving proc we’d rather use on healing touch or regrowth.
Nourish no longer consumes Omen of Clarity.
It’s already been mentioned in the general forums but I didn’t find a bug report on it so I figured I’d add one here just incase it wasn’t a known issue to the dev team.