Plain and somewhat porcellanous (5)

I believe the answer is:

llano

'plain' is the definition.
(a grassy plain)

'somewhat porcellanous' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'LLANO' can be found hidden inside 'porcellanous'.

'and' acts as a link.

(Other definitions for llano that I've seen before include "Treeless area" , "Treeless grassy plain in South America" , "Flat area" , "Grassy plain in South?America" , "(South American) grassy plain" .)

I've seen this clue in The Everyman puzzle in The Observer.

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