Worker up on ridge - maybe he'll run down (6)
I believe the answer is:
slater
'worker' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'up on ridge maybe he'll run down' is the wordplay.
I cannot quite see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is found in the answer.
'run' could be 'r' (cricket abbreviation) and 'r' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for slater that I've seen before include "Man on top" , "High-up person" , "Does one abuse" , "Professional roof worker" , "Alerts (anag) - building worker" .)