Milk containers (7)

I think it could be either:

Which length description are you looking for?:

churns

'milk containers' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for churns that I've seen before include "Machines in which milk is beaten to make butter" , "Large milk containers" , "Beats or wihisks in milk containers?" .)

I've seen this clue in The Guardian.

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