Crossword Genius

Timber preserver (3)

Ross

I believe the answer is:

tar

'timber preserver' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tar that I've seen before include "Cigarette substance" , "Black substance, used on roads" , "Dark viscous flammable substance" , "Sticky substance - seaman" , "Smoker's black deposit" .)

I've seen this clue in The Wall Street Journal.
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