Plumbing the Depths

They call him the professor because of his great wit.
Everything he says has perspicacity in it!
The way he wrangles words should be no great surprise,
for he’s a modern Shakespeare in a plumber’s rough disguise.
Once he unplugs your loo, he is not finished, but instead
he shares a legendary quip to clear out his own head.

Word prompts for the day are: perspiscacity, wrangle, surprise, legendary and professor