The most common and most likely answer to this crossword clue is the 8 letter word WOODSMAN
I've seen this crossword clue in The Guardian
W
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More clues leading to the result WOODSMAN
Buddy explains!

The straight part
We know that "outdoor worker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outdoor worker = woodsman.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WOODSMAN mean?
WOODSMAN noun- A man who lives and works in woodland; a forester or woodman.
- Designating a group of sports related to forestry culture, including axe throwing, wood splitting, wood chopping, axe cutting, chainsaw cutting, pulpwood tossing, log rolling and decking, pole climbing, and fire building.