A paragon of virtue or an errant type! (6)

I believe the answer is:

knight

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'type' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for knight that I've seen before include "... for example, Tippett" , "Chevalier" , "Honour" , "Horse's head on board" , "Dubbed chessman?" .)

I've seen this clue in The Irish News.

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