On which to get down to the job of milking? (5)
I believe the answer is:
stool
'the job of milking?' is the definition.
I can't tell whether this defines the answer.
'on which to get' is the wordplay.
'on which' becomes 'sol' (I can't justify this - if you can you should believe this answer much more).
'get' is an insertion indicator.
'sol' going around 'to' is 'STOOL'.
'down to' is the link.
Can you help me to learn more?
(Other definitions for stool that I've seen before include "Simple seat" , "Armless seat" , "Backless chair" , "Seat without a back" , "Three-legged backless seat" .)