Henry VIII's royal house (5)
I believe the answer is:
tudor
'henry viii's royal house' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tudor that I've seen before include "Welsh royal house" , "Dynasty on the English throne 1485-1603" , "Member of the dynasty ruling England 1485-1603" , "Welsh royal family" , "regal dynasty" .)