Crossword Genius

Thick dark liquid mixture prepared from coal tar, used as a preservative for wood (8)

Ross

I believe the answer is:

creosote

(Other definitions for creosote that I've seen before include "Preservative liquid obtained from coal tar" , "Wood preservative oil" , "Oily liquid obtained from tar" , "Preserve deal, say" , "Fencing gear, perhaps" .)

I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.