Late Perpendicular amalgam of Lancaster and York! (5)

I believe the answer is:

tudor

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'late perpendicular amalgam' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tudor that I've seen before include "Pre-Stuart royal house" , "Half-timbered-house style" , "Regal family" , "Style of architecture in 15th c. England" , "Name of the English royal family of Elizabeth 1st" .)

I've seen this clue in The Irish News.

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