A more upright tradesman (7)
I believe the answer is:
plumber
'tradesman' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for plumber that I've seen before include "tradesman" , "One instals and repairs water and gas fittings" , "domestic technician" , "Repairer of pipes" , "He repairs water pipes, installs washing machines etc" .)