If you are unable to submit PCC before your ITA expires (60 days). You can submit a proof showing that you did everything you could to obtain PCC and it is still in process. Explain it in LOE as well & once you get your PCC you can then submit it to CIC.This is what is worrying me right now. I am afraid I cannot get my police clearance in time and get rejected for my PR
Just make sure that you actually did everything you could to get it and didn't wait for last minute to apply it.