From what I know about Honk Kong police certificates, you'll have to get it later, after you have already applied. I'd include a note saying they don't issue it without a request from CIC and thus you couldn't include it to start with but will be happy to do so when you get that request.
You mean a recent police clearance when you apply, not a recent one once they start processing right?
Thanks again.
Correct. "Recent" at the time when Mississauga receives your application. It's not your fault it can take the visa office months to get to processing the app. They do sometimes request fresh police certificates, so there's no gurantee you won't have to deal with that. But for the most part, if it was fresh when you sent it in, it's ok.