I would personally not take it during PCT. PCT is the time for your body to normalize. You don't want to throw in anything that is going to upset any natural balances in your body. Clen will do that. If you are going to run clen, I would do it during cycle then come off for PCT. Keep in mind clen dosing protocols. I believe you should be 2 weeks on 1 week off or so. I haven't used clen in a long time so I have forgotten the exact dosing protocol.
Honestly bro if you have until January, why don't you just try dieting & cardio? If you REALLY want something why don't you run a Test/Tren cycle? Tren will SHRED you. I've run some oral cycles before, up to 6 weeks stacking, & trust me when I tell you, the darkside is so much better. In all honestly, I would probably use T3 before Clen. I've used both, T3 wins hands down but you better know what you're doing or you'll have hypo/hyperthyroidism & can really hurt yourself.
Also I'd check out the PCT forum. Nolva & Clomid won't cover it all. Better safe than sorry.