Stocking up protection for work-site (8)
I believe the answer is:
hoarding
'stocking' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hoarding that I've seen before include "Temporary screen, round a building site say" , "Temporary fence round a building site." , "Collecting and keeping - large board for advertising" , "Accumulating" , "Storing" .)