The phrase 'clay jar' is correct and usable in written English.
You can use it to refer to a jar made of clay. For example, "We found an ancient clay jar in the tomb."
He tossed a clay jar, wrapped in straw, to Yongsu, and shooed us off.
Only last Friday the skeleton of a cat turned up, carefully packed into a clay jar.
Those who go to the shrine for lottery numbers reach into a clay jar and pull out numbered balls.
Pottery from the site reveals a similar aesthetic orientation, as for example, a red clay jar with an angular geometrical pattern.
And he finds his stomach growling inside a clay jar, where it would have been stored separately after it was removed.
T. H. Vinayakram played ghatam, a pumpkin-size clay jar, making a seemingly unyielding instrument ping, clatter and hoot while he systematically subdivided the beat.
The crystal clear liquid is then matured in clay jars for at least a year.
Many villagers belong to the potter caste and sell clay jars in nearby towns.
Inside were several tall clay jars, among fragments of other jars.
There were clay jars, cooking pots, tankards and kraters, wide bowls used for mixing wine and water.
He spotted a few clay jars filled with old parchments, but he was illiterate and had no use for documents, especially such old ones.
