Hello. Can you please share on how you got a police clearance from angola?
In general, immigration authorities don't look too kindly on people that have overstayed their visa. I have no idea if this is something that would come up on a criminal record, but in my experience you may be asked on the visa application form if you have ever overstayed on a visa in any country.
How long did you overstay and for what reason? If asked, it's best to be honest and forthcoming about why you overstayed. The length of time you overstayed may also have an impact on how likely an immigration official would be to overlook this.
With regards to the police clearance certificate, the internet seems to have a lot of conflicting information, so I think it is best to get in touch with your nearest Angolan embassy for clarity on this.
Best of luck.