Crossword Genius

Coal-tar derivative (8)

Ross

I believe the answer is:

creosote

(Other definitions for creosote that I've seen before include "Wood-preserving oil" , "Oily liquid for preserving timber" , "Preserve deal, say" , "Oily, smelly wood preservative" , "Wood preservative oil" .)

I've seen this clue in the Sydney Morning Herald.
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