Trees around river providing places to load barrels (8)

I believe the answer is:
breeches
'load barrels' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?
'trees around river providing places' is the wordplay.
I cannot really understand how this works, but
'around' could be 're' (regarding) and 're' is found within the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for breeches that I've seen before include "Trousers ending just below the knee" , "Riding trousers" , "Short trousers" , "Trousers reaching to just below the knee" , "Pants" .)
