Luxurious hotel's withdrawn credit (4)
I believe the answer is:
plus
'credit' is the definition.
(I've seen this before)
'luxurious hotel's withdrawn' is the wordplay.
'luxurious' becomes 'plush' (I've seen this before).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'withdrawn' is a deletion indicator.
'plush' with 'h' taken out is 'PLUS'.
(Other definitions for plus that I've seen before include "credit" , "Together with; advantage" , "And, arithmetically" , "Distant" , "Positive - addition" .)