Luxury of clue with open resolution... (8)
I believe the answer is:
opulence
'luxury' is the definition.
('opulence' can be a synonym of 'luxury')
'clue with open resolution' is the wordplay.
'with' says to put letters next to each other.
'resolution' is an anagram indicator.
'clue'+'open'='clueopen'
'clueopen' anagrammed gives 'OPULENCE'.
'of' is the link.
(Other definitions for opulence that I've seen before include "Profusion, luxury" , "Rich quality" , "State of affluence or richness" , "Ostentatious wealth" , "Luxury, sumptuousness" .)