Yes if you have two carrot complications on a single watch face the second complication gives you real time windspeed and direction - looks nice on the utility face too with the weather on the bottom and wind direction in a top corner. It's very useful this time of year for me. We get crazy storms during the changing of seasons in Virginia. The carrot complications are my fave so far. I also have Dark Sky but I like the icons Carrot displays on the mod face. I think you have the pay an additional 1.99 for the real time updates on the watch face but I'm a weather geek so it was a no brainers.
So to answer your question - you can't have the wind direction only - it shows up as the second complication for Carrot.
Cheers,
B