Shoes drinkers left inside (8)
I believe the answer is:
slippers
'shoes' is the definition.
(I have seen 'Indoor shoes ' mean 'slippers' so perhaps 'shoes' could also mean 'slippers')
'drinkers left inside' is the wordplay.
'drinkers' becomes 'sippers' (sipper is a kind of drinker).
'left' becomes 'l' (common abbreviation).
'inside' indicates putting letters inside.
'sippers' going around 'l' is 'SLIPPERS'.
(Other definitions for slippers that I've seen before include "Indoor shoes" , "such may be discarded by bed" , "those who fall over?" , "Indoor footwear" , "Punishes" .)