Some morphia left in bottle (5)
I believe the answer is:
phial
'bottle' is the definition.
(phial is a kind of bottle)
'some morphia left in' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'PHIAL' can be found hidden inside 'morphia left in'.
(Other definitions for phial that I've seen before include "Ampoule" , "Small glass bottle for perfume or medicine" , "Small bottle for liquids" , "glass container" , "little bottle" .)