He trains regularly before work (8)
I believe the answer is:
commuter
This might be a double definition.
'he trains' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'regularly before work' is the second 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?
Can you help me to learn more?
(Other definitions for commuter that I've seen before include "Person who regularly travels some distance to work" , "Regular traveller to work" , "Daily traveller" , "traveller of some standing, perhaps?" , "One who substitutes" .)