Yes, steak can be considered clean in most diets not all, but do try to get the leanest possible. And don't put too much stuff on it. Or it can turn something healthy into something fatening.
Another alternative is buffalo. Tastes a lot like steak but seems to have a bit more flavor, which means you don’t have to marinate it, to have taste. It is a bit leaner and easier to fire-grill, at least always seems to be for me. And looks like steak when cooked so you can basically fool a lot of the picky eaters who don’t know better. This is the only red-meat I can eat. Beef, will send me into an instant Lupus flare, unless it’s hit heavy with steroids etc, and I don’t want it, if it’s had that. A really nice man, gave me buffalo steak as a gift one time, and I didn’t want to waste it, didn’t exactly know what to do with it, so I just simply cooked it like I did beef, and fell in love with it. Especially once I started doing research and found out, buffalo is a bit more healthy, and most are grass feed still.
Kit