How can one get away with saying a noun before a description? I very often come across the following problem. Somebody asks me about a thing/ person/ noun and I start responding by: It's a thing/ person that... Wait, in Chinese you must say the description first and then put a noun. Blimey.

For example, one asks a question: 警察是谁？I want to say that a policeman is a person who chase criminals. So I start: 警察是一个人。。。but it's a wrong start. Can one continue this sentence and get away with starting it wrong, without saying "Oh, sorry, my bad" and restarting?

Beating around the bush and saying the noun at the end is soooooooo unnatural for me. So the way I often say things is: 警察是一个人。。。一个追逐犯人的人。

Is there a more natural or more sophisticated way of getting away with such a mistake? Does my way of correcting myself sound OK?
警察是一个人。。。一个追逐犯人的人。 is also ok, but as you know, they are not very Chinese style.

The bad news is you can not put an attribute clause after your noun.

The good news is there are many other ways.

警察是一种专门抓犯人的人.

警察的工作是专门抓罪犯

You can use 是 to start your description, the description can be started over and over, the subject part would stay there.