More luxurious, like Sir Dicky! (7)
I believe the answer is:
silkier
'more luxurious' is the definition.
Both the definition and answer are comparative adjectives. Perhaps you can see a link between them that I can't see?
'like sir dicky' is the wordplay.
'dicky' is an anagram indicator (dicky can mean ill or non-functioning).
'like'+'sir'='likesir'
'likesir' anagrammed gives 'SILKIER'.
Can you help me to learn more?
(Another definition for silkier that I've seen is " With a smoother gleaming surface".)