Benefit of luxurious hotel overlooked (4)
I believe the answer is:
plus
'benefit' is the definition.
(both can mean an advantageous feature)
'luxurious hotel overlooked' is the wordplay.
'luxurious' becomes 'plush' (I've seen this before).
'hotel' becomes 'h' (phonetic alphabet).
'overlooked' indicates named letters should be taken away.
'plush' with 'h' taken out is 'PLUS'.
'of' acts as a link.
(Other definitions for plus that I've seen before include "And also; a bonus" , "Distant" , "asset" , "Advantage; also" , "mark for arithmetic" .)