The most common and most likely answer to this crossword clue is the 11 letter word SCAFFOLDING
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "workmen’s resource" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case workmen’s resource = scaffolding.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 SCAFFOLDING mean?
SCAFFOLDING verb- To set up a scaffolding; to surround a building with scaffolding.
- To sustain; to provide support for.
- To dispose of the bodies of the dead on a scaffold or raised platform, as by some Native American tribes.
- A temporary modular system of tubes (or formerly wood) forming a framework used to support people and material in the construction or repair of buildings and other large structures.
- Source code etc. that is incomplete and serves as a basis for further development.
- Any framework or support.