Drunk back by hotel? Nonsense (4)
I believe the answer is:
tosh
'nonsense' is the definition.
(tosh is a kind of nonsense)
'drunk back by hotel?' is the wordplay.
'drunk' becomes 'sot' ('sot' can be a synonym of 'drunk').
'back' is a reversal indicator.
'by' is a charade indicator (letters next to each other).
'hotel?' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'sot' in reverse letter order is 'tos'.
'tos'+'h'='TOSH'
(Other definitions for tosh that I've seen before include "Slang nonsense" , "Baloney, twaddle" , "Intimate" , "Boloney" , "Hooey" .)