Pharmacist's container (4)
I believe the answer is:
vial
'pharmacist's container' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for vial that I've seen before include "Small container for liquids" , "Bottle that contains a drug" , "Small glass container" , "Small bottle used for medicines, laboratory work, etc" , "Small container for liquid medicine" .)