You are looking for a quick fix and sadly - there isn't one.
Steroids do not burn body fat. They increase muscle protein synthesis and prevent muscle catabolism. I feel like I am beating a dead horse saying this over and over but it's a very common misconception and something a lot of people get wrong. Bodybuilders commonly include steroids into their pre-contest cycles to prevent muscle loss when dieting on low calories and doing lots of cardio. The steroids themselves do not burn body fat.
Clen simply raises metabolism. It does not differentiate between muscle or fat. Clen might raise your metabolism an additional 100-200 calories per day. You could just easily do an extra 15 minutes of cardio. I have used clen in the past and I always felt it did more harm then good. It caused muscle cramps when I was training and it really negatively impacted my sleep.
There are better alternatives that directly increase fat loss, with no risk of loosing muscle mass and no side effects like insomnia or muscle cramps. Cardarine gw is going to be your best option. It directly increases fat loss, endurance and recovery. It is not a stimulant or a hormone and is pretty much void of side effects.
I haven't used clen myself in years and don't recommend it to my clients at all anymore. If they are trying to burn fat, I recommend cardarine and maybe a good nutrient partitioning supplement like n2slin from n2bm.com.
If you want to loose body fat - You need to perfect your diet and training. Its as simple as that. Fat is basically stored energy. To burn fat, you need to expend more calories then you consume.