Containers stop overturning (4)
I believe the answer is:
pots
'containers' is the definition.
(pot is a kind of container)
'stop overturning' is the wordplay.
'overturning' says the letters should be written in reverse.
'stop' back-to-front is 'POTS'.
(Other definitions for pots that I've seen before include "Containers; oodles" , "Gets (a ball) into pocket" , "Preserves" , "Cooking utensils" , "Stop (anag.)" .)