Support for carpenter's spotted nag (8)
I believe the answer is:
sawhorse
'support for carpenter's' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'spotted nag' is the wordplay.
'spotted' becomes 'saw' (I've seen this in another clue).
'nag' becomes 'horse' (a nag is an old horse).
'saw'+'horse'='SAWHORSE'
Can you help me to learn more?
(Other definitions for sawhorse that I've seen before include "stand for cutting" , "Rack" , "support for chippy" , "Mobile carpentry station" , "cutting support" .)