The most common and most likely answer to this crossword clue is the 6 letter word LAVISH
I've seen this crossword clue in The Guardian
L
A
V
I
S
H
More clues leading to the result LAVISH
- Very generous, like ladies and gents?
- Ridicule about six as extravagant
- Opulent island hotel bathroom’s the top feature
- Extravagant, somewhat like throne room?
- Like a loo to be luxurious?
- Note to guard against one son becoming prodigal
- Sumptuous little room is first in house
- It’s pointlessly subject to being extravagant
- Before 9, delight in being generous
- Like a loo can be extravagant!
Buddy explains!

The straight part
We know that "luxurious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case luxurious = lavish.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LAVISH mean?
LAVISH verb- To give out extremely generously; to squander.
- To give out to (somebody) extremely generously.
- Expending or bestowing profusely; profuse; prodigal.
- Superabundant; excessive