Crossword Genius

Fence preservative (8)

Ross

I believe the answer is:

creosote

(Other definitions for creosote that I've seen before include "Wood-preserving oil" , "Oily liquid obtained from tar" , "Wood preserver made from coal tar" , "Oily liquid preservative -- eco-store (anag)" , "Oily liquid for preserving timber" .)

I've seen this clue in The Mirror and The Sun.
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