Hotel with not much custom (5)
I believe the answer is:
habit
'custom' is the definition.
(I know that habit is a type of custom)
'hotel with not much' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' is a charade indicator (letters next to each other).
'not much' becomes 'a bit' (a bit can mean a small amount).
'h'+'abit'='HABIT'
(Other definitions for habit that I've seen before include "Custom or monk's robe" , "Ingrained behaviour" , "Routine - clothing" , "Custom - costume" , "Addiction to a drug" .)