Opulent, lavish (5)
I believe the answer is:
grand
I believe this clue is a double definition.
'opulent' is the first definition.
(I know that opulent can be written as grand)
'lavish' is the second definition.
(thesaurus)
(Other definitions for grand that I've seen before include "Exalted, magnificent" , "PS1k" , "Stately - splendid" , "A slangy PS1,000" , "Piano; thousand pounds" .)