I always have some clanking and fret buzz, as I have always had poor technique. As has been mentioned, the best way is to minimize it, best you can, and then do some minimal "smoothing" of the track during the mixing process. You probably won't want to EQ to the point of removing it, as you are likely to affect the tone too much doing that (that's been my experience, anyway). Also, as others have mentioned, once it gets mixed in with everything, it probably won't be too noticeable. The track below had a good bit of buzz, and you can still hear it in there a bit, but once things were mixed and mastered, it didn't bother me. Your standards may be different than mine, but I've been recording for a long time, and unless the buzzing is so bad that you can't make out the notes being played, the engineers should be able to make it work. Good luck.
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