Roadside bear (8)
I believe the answer is:
shoulder
This might be a double definition.
'roadside' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'bear' is the second definition.
(both can mean to carry or take responsibility for)
Can you help me to learn more?
(Other definitions for shoulder that I've seen before include "take responsibility?" , "Upper body joint" , "Undertake (burden)" , "Carry a burden" , "Joint - ours held (anag)" .)