Sloshed stars met in bed (8)
I believe the answer is:
mattress
'in bed' is the definition.
('mattress' is part of 'bed')
'sloshed stars met' is the wordplay.
'sloshed' is an anagram indicator.
'stars'+'met'='starsmet'
'starsmet' anagrammed gives 'MATTRESS'.
(Other definitions for mattress that I've seen before include "Stuffed bag on which to sleep" , "Padded bag on which to sleep" , "Nap on this" , "For the smart set to lie on?" , "Sleeping support" .)