I have seen practice show up on a couple of questions now. I should think that it is a given that people are here to learn and practice. Comes part and parcel with the territory of SE and especially Arts & Crafts.SE
Definitely feels like a meta tag that we don't want.
The tag can't work as the only tag on a question and the tag means different things to different crafts. The searching of the word practice should be enough.
I think this is an obvious candidate for outright removal. It's only on 2 questions currently so a couple of little bumps are not going to hurt anyone.
In the case of practice( which seems similar to technique to me) this tag could easily be added to many questions. Does it add any value to them or make them easier to find? Perhaps. There likely isn't any harm in using them. If we are to keep practice it would be nice to get a good wiki and understanding of sample usage.