A lack of response from clen isn't due to diet. It's possible they just don't respond to the drug or maybe they do but they lack enough beta-2 receptors for it to make a worthwhile difference.
I'm personally not a fan of clen. I'd rather use T3 which is what I'm using now but you should be on a cycle to use it to prevent the muscle wAste. When you figure out your macros post them up brother. Can't hurt for someone to provide their $.02 in case you may miss something. Good luck and be safe!