Smoker's accessory lost around hotel (7)
I believe the answer is:
ashtray
'smoker's accessory' is the definition.
(receptacle for cigarette ash)
'lost around hotel' is the wordplay.
'lost' becomes 'astray' (synonyms).
'around' is an insertion indicator.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'astray' enclosing 'h' is 'ASHTRAY'.
(Other definitions for ashtray that I've seen before include "Where to rest cigarette" , "Place for detritus from cigarettes, cigars etc" , "Receptacle for cigarette butts" , "Dish for smokers" , "where smoking remains are found" .)