Processing plant (8)

I believe the answer is:

refinery

'processing plant' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for refinery that I've seen before include "Chemical plant" , "Industrial plant for purifying a crude substance" , "Plant for purifying, oil say" , "Industrial plant for purifying crude substances" , "Purification plant" .)

I've seen this clue in The Telegraph and the Penny Press.

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