Did a smith's job (4)
I believe the answer is:
shod
'did a smith's job' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shod that I've seen before include "(Of a horse) with shoes on" , "Like a horse that's been to a farrier" , "Wearing footgear" , "Exclamation used to frighten animals away" , "Fitted with shoes" .)