Agitate a liquid container (5)
I believe the answer is:
churn
This clue might be a double definition.
'agitate' is the first definition.
(I've seen this in another clue)
'a liquid container' is the second definition.
'churn' can be an answer for 'container' (churn is a kind of container). I am not certain of the 'a liquid' bit.
Can you help me to learn more?
(Other definitions for churn that I've seen before include "There may be agitation in this" , "Kind of barrel in which butter in made" , "Butter-making machine" , "Shake" , "Large metal milk container" .)