Donkey-work from home in the ground (6)
I believe the answer is:
burrow
'donkey-work from home in the ground' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'donkey-work' is the wordplay.
'donkey' becomes 'burro' (term for a small donkey).
'work' becomes 'w' (physics abbreviation).
'burro'+'w'='BURROW'
Can you help me to learn more?
(Other definitions for burrow that I've seen before include "Tunnel dug by rabbit" , "Animal's hole in the ground" , "Hole in the ground made by an animal" , "Animal's hole or tunnel" , "Dig tunnels" .)