This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Resembling or containing clay.

adj. Consisting of clay; abounding with clay; partaking of clay; like clay.

. Consisting of or of the nature of clay; abounding with clay; mixed with clay; like clay.

Bedaubed or besmeared with clay.

adj. (used of soil) compact and fine-grained

adj. resembling or containing clay

"Soils that contain a lot of clay are called clayey soils."

compact   

argillaceous    clayish   

silty    alluvial    windblown    argillaceous    calcareous    pebbly    chalky    hard-packed    leaf-mould    turfy