8 down
Preserving
wood,
one
going
in
strong,
ecofreak?
(10)
Preserving wood, one going in strong, ecofreak? (10)
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The definition is at the beginning of the clue.
How the clue works
The definition is Preserving wood — creosote being the classic stuff you slap on fences and railway sleepers. For the wordplay, "ecofreak?" signals an anagram of strong eco, and then you take one (I) and place it inside ("going in") that anagram, giving you CREOSOTING.