Time affected dour house (5)
I believe the answer is:
tudor
'house' is the definition.
(royal house)
'time affected dour' is the wordplay.
'time' becomes 't' (abbreviation).
'affected' is an anagram indicator.
'dour' anagrammed gives 'udor'.
't'+'udor'='TUDOR'
(Other definitions for tudor that I've seen before include "Style of architecture in 15th c. England" , "A royal house of England" , "Name of English royal family during 16th century" , "Dynasty on the English throne 1485-1603" , "Royal house of Henry VIII" .)