the reason why macronutrients have a calorie denomination is because the body can utilize all 3 of them for energy expenditures. the body will always prioritize carbohydrates over dietary fat.
clen will increase your metabolic rate because it's a beta 2-agonist, which acts like adrenaline on your heart, speeding up heart rate, and increasing blood pressure. it has the harshest side effects of all the fat burners used in bodybuilding, i would be careful with using it since it really isn't that effective compared to the side effects it induces.
don't get clen or t3 in liquid form, it will be garbage and the dosing will be wrong because they both degrade rapidly in liquid solutions. try to get capsules or pressed tabs ideally.