Friend has one container (4)
I believe the answer is:
pail
'container' is the definition.
(pail is a kind of container)
'friend has one' is the wordplay.
'friend' becomes 'pal' (pal can mean a friend).
'has' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'pal' placed around 'i' is 'PAIL'.
(Other definitions for pail that I've seen before include "it may go down well" , "water-carrier" , "Open-topped container" , "Vessel for carrying liquids" , "Milkmaid's bucket?" .)